Is the following numbers in proportion?
$4, 12, 6, 18$

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Solution

The given numbers are $4, 12, 6, 18$
We know that,
Four terms are said to be an in proportion if
Product of extreme $=$ Product of means
Product of extremes $= 4 \times 18$
$= 72$
Product of means $= 12 \times 6$
$= 72$
since $4 \times 18 = 12 \times 6$
Hence, the given numbers are in proportion

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