Question 58

The third proportional of two numbers 4 and 20 is

Solution

Three numbers a,b,c are in proportion iff $$b^2 = ac$$

Here, a = 4 and b = 20

=> $$(20)^2 = 4 \times c$$

=> $$c = \frac{20 \times 20}{4} = 5 \times 20$$

=> $$c = 100$$

=> Ans - (C)


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