Basic College Mathematics (10th Edition)

Published by Pearson
ISBN 10: 0134467795
ISBN 13: 978-0-13446-779-5

Chapter 5 - Ratio and Proportion - Mixed Review Exercises - Page 374: 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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