Prealgebra (7th Edition)

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

Chapter 6 - Section 6.2 - Proportions - Exercise Set - Page 427: 25



Work Step by Step

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 $b \cdot c$. $2\frac{2}{5} = \frac{12}{5}$ $\frac{12}{5}*\frac{1}{4} = \frac{3}{5}, \frac{10}{9}*\frac{2}{3} = \frac{20}{27}, \frac{3}{5} \neq \frac{20}{27} \rightarrow$ false
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