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Three numbers a,b,c are in proportion iff $$b^2 = ac$$
Here, a = 12 and b = 48
=> $$(48)^2 = 12 \times c$$
=> $$c = \frac{48 \times 48}{12} = 4 \times 48$$
=> $$c = 192$$
=> Ans - (C)
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