If $5, 30, 3$ and $x$ are in proportion, then $x =____$ $[x = 18 / x = 15]$

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Solution

Since $5, 30, 3$ and $x$ are in proportion.
Therefore,
$\frac{5}{30} = \frac{3}{x} x = \frac{3 \times 30}{5} x = 18$
Hence, the value of $x = 18$

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