If 4 : 5 : : x : 45, then x =

(a) 54
(b) 60
(c) 36
(d) 30

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Solution

$4 : 5 : : x : 45 \Rightarrow \frac{4}{5} = \frac{x}{45} \Rightarrow \frac{4 \times 45}{5} = \frac{x \times 45}{45} \Rightarrow \frac{4 \times 9}{1} = x \Rightarrow x = 36$

Hence, the correct option is (c).

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Similar questions

If $4 : 5 :: x : 45,$ then the value of $x$ is
(a) $54$
(b) $60$
(c) $36$
(d) $30$

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