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Finding the Fourth Proportional to 387.82, 581.75 and 99.25

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Solution

The fourth proportional to 387.82, 581.75 and 99.25 is: 148.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.82 : 581.75 = 99.25 : x
  2. Step 2: Convert to fraction form
    387.82/581.75 = 99.25/x
  3. Step 3: Cross multiply
    387.82x = 581.75 × 99.25
  4. Step 4: Simplify right side
    387.82x = 57,738.69
  5. Step 5: Solve for x
    x = 57,738.69/387.82
  6. Step 6: Final answer
    x = 148.88

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