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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