First, second and third terms of proportion are $9, 27$ and $3$ respectively. Find the fourth term.

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Solution

Let the fourth term be $x$ then $9, 27, 3$ and $x$ are in proportion.
We know that when terms are in proportion
Product of means $=$ Product of extremes
$27 \times 3 = 9 \times x$
$x = \frac{27 \times 3}{9} x = 9$
Hence, the fourth term is $9$

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