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Finding the Fourth Proportional to 387.35, 581.05 and 98.78

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Solution

The fourth proportional to 387.35, 581.05 and 98.78 is: 148.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.35 : 581.05 = 98.78 : x
  2. Step 2: Convert to fraction form
    387.35/581.05 = 98.78/x
  3. Step 3: Cross multiply
    387.35x = 581.05 × 98.78
  4. Step 4: Simplify right side
    387.35x = 57,397.57
  5. Step 5: Solve for x
    x = 57,397.57/387.35
  6. Step 6: Final answer
    x = 148.18

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