Are the following numbers in proportion?
$13, 27, 39, 81$

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Solution

Checking whether the numbers are in proportion or not :
The given numbers are $13, 27, 39, 81$
We know that,
Four terms are said to be an in proportion if
Product of extreme $=$ Product of means
Product of extremes $= 13 \times 81$
$= 1053$
Product of means $= 27 \times 39$
$= 1053$
Since, $13 \times 81 = 27 \times 39$
Hence, the given numbers are in proportion

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