Fill in the following boxes so that the four numbers are in proportion:
20,18,40,___

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Solution

If $a, b, c, d$ are four numbers such that $\frac{a}{b} = \frac{c}{d}$ , then $a, b, c, d$ are said to be in proportion
Assume the missing number be $x$ ,
then
$\frac{20}{18} = \frac{40}{x} x = \frac{40 \times 18}{20} = 36$
Hence, the required answer is $36 .$

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