Question

    What is the fourth proportional to 2, 5,

    12?
    A 30 Correct Answer Incorrect Answer
    B 21 Correct Answer Incorrect Answer
    C 36 Correct Answer Incorrect Answer
    D 14 Correct Answer Incorrect Answer

    Solution

    Let the fourth proportion be x. Then, => 2 : 5 :: 12 : x => 2x = 5 × 12 => x = (5 × 12)/2 = 30

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