 | William Frothingham Bradbury, Grenville C. Emery - Algebra - 1889 - 428 pages
...two terms together are called a couplet. 169. Proportion is an equality of ratios. Four numbers are proportional when the ratio of the first to the second is equal to the ratio of the third to the fourth. The equality of two ratios is indicated by the sign of equality (=) or by four... | |
 | Edward Albert Bowser - Geometry - 1890 - 414 pages
...EATIO AND PROPORTION. SIMILAE FIGURES. D'EFINITIOTSS. 277. 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, if £ = ° then, A, B, C, D are said to be in proportion. The proportion... | |
 | Edward Albert Bowser - Geometry - 1891 - 424 pages
...KATIO AND PKOPOKTION. SIMILAR FIGUKES. DEFINITIONS. 277. Four quantities are said to be in proportion when the ratio of the first to the second is equal to the ratio oi the third to the fourth. Thus, if g = g, then, A, B, C, D are said to be in proportion. The proportion... | |
 | Nathan Fellowes Dupuis - Algebra - 1892 - 362 pages
...quantity. PROPORTION. 82. Pour quantities are proportional, or are in proportion, or form a proportion, when 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 proportional when a : b •— с : d. This may be expressed... | |
 | Euclid - Geometry - 1892 - 460 pages
...: A is the reciprocal of A : B. g. Three magnitudes of the same kind are said to be proportionals, when the ratio of the first to the second is equal to that of the second to the third. Thus A, B, C are proportionals if • A : B :: B : C. B is called... | |
 | Irving Stringham - Algebra - 1893 - 164 pages
...that of the second to the third." n. "Three or more magnitudes are said to be in continued proportion when the ratio of the first to the second is equal to that of the second to the third, and the ratio of the second to the third is equal to that of the third... | |
 | Charles Smith - Algebra - 1894 - 620 pages
...the ratio of the differences will be equal to the original ratio. PROPORTION. 242. Definition. Four quantities are said to be proportional when the ratio...the first to the second is equal to the ratio of the third to the fourth. Thus a, b, c, d are proportional, if a : b = с : d. This is sometimes expressed... | |
 | Charles Smith - Arithmetic - 1895 - 414 pages
...cd. 24 cu. ft., and the ratio being £, or 8 : 9. PROPORTION. 203. When four quantities are such that the ratio of the first to the second is equal to the ratio of the third to the fourth, the four quantities are said to be Proportionals. For example, the ratio $5 :... | |
 | George D. Pettee - Geometry, Modern - 1896 - 272 pages
...DEFINITIONS 183. A Proportion is an equality of ratios. 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. A proportion may be written in either of the following forms: a: b = c : d, or... | |
| |
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. 
