Check the following number is in proportion or not? $12, 15, 18$ and $20$

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Solution

Check the numbers are in proportion or not:
Let and $20$ are in proportion.
So, $12 : 15 : : 18 : 20$
$\Rightarrow \frac{12}{15} = \frac{18}{20}$
$\Rightarrow \frac{4}{5} \neq \frac{9}{10}$
Hence, $12, 15, 18$ and $20$ are not in proportion.

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