Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0




Work Step by Step

In order to solve for d the proportion $\frac{2}{3}$=$\frac{d}{18}$, we must apply the Cross Products Property of a Proportion that states that if $\frac{a}{b}$=$\frac{c}{d}$, where b$\ne$0 and d$\ne$0, then ad=bc. We'll set a=2, b=3, c=d and d=18, and apply the Property. $\frac{5}{6}$=$\frac{x}{15}$ (2)(18)=(d)(3) 36=3d Then, to solve for d, we'll divide by 3 on both sides of the equation $\frac{36}{3}$=$\frac{3d}{3}$ d=$\frac{36}{3}$=12
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