Question 85

The third proportional of two numbers 4 and 28 is _______.

Solution

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

Here, a = 4 and b = 28

=> $$(28)^2 = 4 \times c$$

=> $$c = \frac{28 \times 28}{4} = 7 \times 28$$

=> $$c = 196$$

=> Ans - (D)


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