Answer
x=3
Work Step by Step
Set the product of the means equal to the product of the extremes and solve for the variable.
$4\times9=x \times12$
$36=12x$
$36\div12=12x\div12$
$3=x$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 7 - Section 7.2 - Proportion - Exercises - Page 277: 13
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