Answer: Option D
Explanation:
Let the 3rd proportional = k Then, 15 : 30 : : 30 : k ⇒ 15/30 = 30/k ⇒ 15k = 30 x 30 ∴ 15k = 30 x 30 ∴ k = (30 x 30) / 15 = 60
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