| George Chrystal - Algebra - 1898 - 476 pages
...follows : — F<mr algebraic quantities a, b, c, d are said to be in proportion wlien a/b = c/d, that is, when the ratio of the first to the second is equal to the ratio of the third to tlie fourth. We may write this relation with the special notation a : b = с : d whenever it is desirable... | |
| George Chrystal - Algebra - 1898 - 480 pages
...— • Four algebraic quantities a, b, c, d are said to be in proportion wlwn a/b = c/d, that is, when the ratio of the first to the second is equal to the ratio of the third to tlie fourth. We may write this relation with the special notation a : b = c : d whenever it is desirable... | |
| Frank Castle - Mathematics - 1899 - 424 pages
...equal, the four terms are said to be in proportion, hence : Four quantities are said to be proportional, when the ratio of the first to the second is equal to the ratio of the third to the fourth. That is, when the first is the same multiple or sub-multiple of the second, which the third is of the... | |
| Charles Austin Hobbs - Geometry, Plane - 1899 - 266 pages
...form, the proportion may be written a:b::d:c. Hence, four quantities are reciprocally proportional when the ratio of the first to the second is equal to the ratio of the fourth to the third. When the terms of each ratio of a proportion are interchanged, the four quantities... | |
| James Morford Taylor - Algebra - 1900 - 504 pages
...16. Which is the greater ratio, 7:5 or 7 + 2:5 + 2? PROPORTION. 324. Four quantities are said to be in proportion when the ratio of the first to the second...is equal to the ratio of the third to the fourth. An equality whose members are two equal ratios is called a proportion. Thus, if a : b = с : d, (1)... | |
| George Edward Atwood - 1900 - 276 pages
...equality or by the double colon, as follows : a:b=c:d ?=£ a:b::c:d bd 416. Four numbers are said to be in proportion when the ratio of the first to the second...is equal to the ratio of the third to the fourth. The four numbers are called proportionals, and the fourth number is called a, fourth proportional.... | |
| Frank Castle - Mathematics - 1900 - 184 pages
...equal, the four terms are said to be in proportion, hence : Four quantities are said to be proportional, when the ratio of the first to the second is equal to the ratio of the third to the fourth. That is, when the first is the same multiple or sub-multiple of the second, which the third is of the... | |
| George Albert Wentworth, George Anthony Hill - Geometry - 1901 - 168 pages
...lines. EXERCISE 95. Proportion. Four quantities are said to bo proportional, or to form a proportion, if the ratio of the first to the second is equal to the ratio of the third to the fourth. The four quantities are called the terms of the proportion ; the first and the fourth are called the... | |
| International Correspondence Schools - Sheet-metal work - 1901 - 578 pages
...the ratio 135 quarts to 63 quarts? Ans. The ratios are equal. 1.2. When four numbers are such that the ratio of the first to the second is equal to the ratio of the third to the fourth, the four numbers are said to be proportionals; and a statement of the equality of the two ratios is... | |
| Metal-work - 1901 - 548 pages
...example, the three numbers 36, 18, and 9 are in continued proportion. For, we have ff = y ; that is, the ratio of the first to the second is equal to the ratio of the second to the third. In this example, 18 is the mean proportional between 30 and 9, and 9 is the third... | |
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