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Finding the Fourth Proportional to 87,320, 130,980 and 31,916

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Solution

The fourth proportional to 87,320, 130,980 and 31,916 is: 47,874

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,320 : 130,980 = 31,916 : x
  2. Step 2: Convert to fraction form
    87,320/130,980 = 31,916/x
  3. Step 3: Cross multiply
    87,320x = 130,980 × 31,916
  4. Step 4: Simplify right side
    87,320x = 4,180,357,680
  5. Step 5: Solve for x
    x = 4,180,357,680/87,320
  6. Step 6: Final answer
    x = 47,874

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