Basic College Mathematics (10th Edition)

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

Chapter 5 - Ratio and Proportion - 5.4 Solving Problems - 5.4 Exercises - Page 356: 3



Work Step by Step

We are given the proportion $\frac{1}{3}=\frac{x}{12}$. We can setting the cross products equal to each other and solving for the unknown variable. $1\times12=3\times x$ $12=3x$ Divide both sides by 3. $x=4$
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