Answer
6
Work Step by Step
$\frac{12}{4}$=$\frac{18}{x}$ set cross products equal
12x=4$\times$18
12x =72 divide by 12 both sides
$\frac{12x}{12}$=$\frac{72}{12}$
x=6
The missing length is 6 units
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 6 - Section 6.5 - Congruent and Similar Triangles - Exercise Set - Page 452: 15
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