Homework Help: Algebra

Posted by Brianna on Thursday, October 13, 2011 at 7:51am.

Two rectangles are similar. The first is 4in. wide and 15in. long. The second is 9in. wide. Find the length of the second rectangle.

Algebra - Reiny, Thursday, October 13, 2011 at 8:27am
Similar polygons have corresponding sides in the same ratio, so

4/15 = 9/x
4x=135
x = 135/4 or 33.75

the 2nd side is 135/4

check:
9 : (135/4)
=36:135
= 4 : 15
= 20:27

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