Answer
a=4
Work Step by Step
Set the product of the means equal to the product of the extremes and solve for the variable.
$a\times4=1 \times16$
$4a=16$
$4a\div4=16\div4$
$a=4$
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: 14
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