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  1. The fourth proportional to 0.2, 0.12 and 0.3 is ?
    1. 0.13
    2. 0.15
    3. 0.18
    4. 0.8
Correct Option: C

Let 0.2 : 0.12 : : 0.3 : N
∵ 0.2 x N = 0.12 x 0.3
∴ N = (0.12 x 0.3) / 0.2 = 0.18


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