 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.  An Elementary Geometry - Page 25by William Frothingham Bradbury - 1872 - 110 pagesFull view - About this book
 | Benjamin Greenleaf - Geometry - 1873 - 202 pages
...compounded of A : B and C : D is .= X j^, 94. A Proportion is an equality of ratios. Four magnitudes are in proportion, when the ratio of the first to the second is the same as that of the third to the fourth. Thus, the ratios of A : B and X : Y, being equal to each... | |
 | Daniel W. Fish - Arithmetic - 1874 - 540 pages
...the consequents ; 8 and 5 are the extremes, 4 and 10 are the means. Three numbers are proportional, when the ratio of the first to the second is equal to the ratio of the second to the third. Thus the numbers 4, 10, and 25 are proportional, since 4 : 10 = 10 : 25 the ratio... | |
 | Daniel W. Fish - Arithmetic - 1874 - 302 pages
...the consequents; 8 and 5 are the extremes, 4 and 10 are the means. Three numbers are proportional, when the ratio of the first to the second is equal to the ratio of the second to the third. Thus the numbers 4, 10, and 25 are proportional, since 4 : 10 = 10 : 25, the ratio... | |
 | Benjamin Greenleaf - Geometry - 1874 - 206 pages
...compounded- of A : B and C : D is -= X ^, 94. A Proportion is an equality of ratios. Four magnitudes are in proportion, when the ratio of the first to the second is the same as that of the third to the fourth. Thus, the ratios of A : B and X : Y, being equal to each... | |
 | Charles Davies - Algebra - 1875 - 490 pages
...亡 Ⅰ ・ 夕 @ @ ら @ ・ 七 obepⅠoportl０Ⅱ れ Ⅰ 士 06 ・ Ihus @ の ㏄ る ・ 182. Four quantities are in proportion when the ratio of...is equal to the ratio of the third to the fourth. Thus, if み ぱ 一 一 一 一 ' のり ・ theuaHt" q ・ n @ e8 の ， & ， c ， andd ， ares... | |
 | Richard Wormell - 1876 - 268 pages
...the ratio A to B. 61. Proportion is the equality of ratios. In other words, four magnitudes form a proportion when the ratio of the first to the second...is equal to the ratio of the third to the fourth. Since the two members of any equality can be interchanged, it follows from this definition that if... | |
 | William Frothingham Bradbury - Algebra - 1877 - 280 pages
...to 6, or a divided by I. 1C5. PROPORTION is an equality of ratios. Four quantities are proportional when the ratio of the first to the second is equal...indicated by the sign of equality (=) or by four dots (::). ft g Thus, a : b = с : d, or a : b : : с : d, or j = -. : read, a to b equals с to d, or a... | |
 | James Hamblin Smith, Thomas Kirkland - Arithmetic - 1877 - 376 pages
...number required = 3X9, .'. number required = ^T = 5|.. 219. Three numbers are said to be in OtwrnroED PROPORTION when the ratio of the first to the second is equal to the ratio of the second to the third. Thus 3, 6, 12 are continued proportion, for f = A. The second number is called... | |
 | Elias Loomis - Conic sections - 1877 - 458 pages
...consequent ; if equal, equal ; and if less, less. 1 2. Three quantities are said to be proportional when the ratio of the first to the second is equal to the ratio of the second to the third ; thus, if A, B, and.C are in proportion, then A:B::B:C, or, A:B=B:C. In this case... | |
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