Prealgebra (7th Edition)

Published by Pearson
ISBN 10: 0321955048
ISBN 13: 978-0-32195-504-3

Chapter 6 - Section 6.2 - Proportions - Exercise Set: 30


$\frac{6}{8} = \frac{9}{12}$ True

Work Step by Step

x is to y is the same as $\frac{x}{y}$ To determine if a proportion is true, we have to find if the cross products are equal. The cross products of $\frac{a}{b}=\frac{c}{d}$ are $a \cdot d$ and $b \cdot c$. Six is to eight as nine is to twelve is the same as $\frac{6}{8} = \frac{9}{12}$ This proportion is true because $6*12=9*8=72$
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