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" In any proportion, the product of the means is equal to the product of the extremes. "
The Youth's Assistant in Theoretic and Practical Arithmetic: Designed for ... - Page 73
by Zadock Thompson - 1832 - 168 pages
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An Introduction to Technical Mathematics, with Computing

Gabriel Kousourou, Sidney N. Sonsky, Frank Scalzo - Mathematics - 1979 - 542 pages
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Barron's Regents Exams and Answers: Three-year Sequence for High School ...

Lester W. Schlumpf, Lawrence S. Leff - Computers - 1983 - 516 pages
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Geometry - Plane, Solid and Analytic Problem Solver

Research & Education Association Editors, Ernest Woodward - Mathematics - 2012 - 1080 pages
...congruent angles. 10. AA = AA 11. Corresponding sides of similar triangles are in proportion. 12. In a proportion, the product of the means is equal to the product of the extremes. • PROBLEM 531 Using Ptolemy's Theorem show that if a anS b, with a ^ b, are chords of two arcs of...
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Applied Problems in Mathematics for Agriculture

Clifford M. Hokanson - Technology & Engineering - 1984 - 272 pages
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The High School Geometry Tutor

The Editors of Rea - Business & Economics - 1985 - 366 pages
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A Brief Course in Arithmetic

Ann Faber, Gale Edgerton, Paul Karanevich - Mathematics - 1985 - 254 pages
...proportion amounts to multiplying the "means" (inner numbers) and the "extremes" (outer numbers). If the product of the means is equal to the product of the extremes, the ratios are equal. 2X2 = 4 1:2 2:4 1 X4 = 4 4 = 4, so that 1 :2 = 2:4 is a proportion. I Example...
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Geometry I Essentials

The Editors of REA - Mathematics - 2013 - 112 pages
...c are called the means of the proportion. The single term d is called the fourth proportional. In a proportion, the product of the means is equal to the product of the extremes. Theorem 2 A proportion may be written by inversion. (If alb = eld, then bla = die.) Theorem 3 •i...
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Elementary Algebra for College Students

Allen R. Angel - Mathematics - 1988 - 456 pages
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Geometry for Enjoyment and Challenge

Richard Rhoad - Geometry - 1988 - 780 pages
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