 | Mathematics - 1915 - 832 pages
...ratios is said to form a proportion, or in other words 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. Thus 5 ft. $25 2 ft. $10 is a proportion. This is often written 5 ft. : 2 ft. :: $25 : $10... | |
 | Harry Morton Keal, Nancy Seymour Phelps - Mathematics - 1917 - 240 pages
...x+5 x+25 x-4 x-2 5x-7 l0x+11 12. 3x-5 6x+ 7 3x DIRECT VARIATION 91 20. Find three consecutive numbers such that the ratio of the first to the second is equal to the ratio of 5 times the third to 5 times the first plus 16. Variation 101 Direct Proportion: If a train travels... | |
 | Harry Morton Keal - Mathematics - 1917 - 148 pages
...ratio of 21° to the supplement of the same angle. Find the angle. 20. Find three consecutive numbers such that the ratio of the first to the second is equal to the ratio of 5 times the third to 5 times the first plus 16. Variation 101 Direct Proportion: If a train travels... | |
 | George Hervey Hallett, Robert Franklin Anderson - Algebra - 1917 - 432 pages
...а с 174. Continued proportion. Three or more numbers are said to be in continued proportion when the ratio of the first to the second is equal to the ratio of the second to the third, and so on. Thus, a, 6, c, d are in continued proportion if, 175. Mean proportional.... | |
 | Henry Sinclair Hall - 1918 - 382 pages
...y, or г = ж + y. У PROPORTION. 348. DEFINITION. 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. The four quantities are called proportionals, or the terms of the proportion. Thus, if - =... | |
 | 890 pages
...started. В : PROPORTION 1.4 Definition Four quantities are said to be in proportion or proportional if the ratio of the first to the second is equal to the ratio of the third to the fourth. Thus a, b, c, d are in the proportion or proportional if the ratio of 'a to b be equal to а... | |
 | 646 pages
...c2+d2 Continued Proportion Quantities of the same kinds are said to be in continued proportion when the ratio of the first to the second is equal to the ratio of the second to the third and is equal to the ratio of the third to the fourth, and so on. Thus, a, b, c,... | |
| |
Four quantities are in proportion when the ratio of the first to the second is equal to the ratio of the third to the fourth. 
