Geometry: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281159
ISBN 13: 978-0-13328-115-6

Chapter 7 - Similarity - 7-1 Ratios and Proportions - Lesson Check: 7

Answer

The second line should equate the product of the means and the product of the extremes. 7x=12. Then, the third line would be x=$\frac{12}{7}$

Work Step by Step

We are given the proportion $\frac{7}{3}$ = $\frac{4}{x}$ We use the cross product $\frac{a}{b}$ = $\frac{c}{d}$, which equals ad=bc So: 7x = 3(4); or 7x = 12 Divide both sides by 7 to get a correct answer of x = $\frac{12}{7}$
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