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 - Page 374: 48

Answer

$x=6.5$

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. $7.8\times x=3.9\times13$ $7.8x=50.7$ Divide both sides by 7.8. $\frac{7.8x}{7.8}=\frac{50.7}{7.8}$ $x=6.5$
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