Question

    What is the fourth proportional

    of √20, √30, and √18?
    A 2√2 Correct Answer Incorrect Answer
    B 5√2 Correct Answer Incorrect Answer
    C 2√3 Correct Answer Incorrect Answer
    D 3√2 Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let the fourth proportional be 'x.' According to the question, √20 ÷ √30 = √18 ÷ x Or, x = √18 × (√30/√20) x = 3√2

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