Answer
The ratios are equal.
Work Step by Step
Multiply the means and extremes. If the products are equal the ratios are equal.
$3\times 21\overset? = 7\times9$
$63=63$
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 276: 10
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