Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapter 5 - Ratio and Proportion - Review Exercises: 32

Answer

$x\approx8.17$

Work Step by Step

We can set the cross products of the given proportion equal to each other and then solve for the unknown variable. $7\times21=x\times18$ $147=18x$ Divide both sides by 18. $\frac{147}{18}=\frac{18x}{18}$ $x\approx8.17$
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