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Finding the Fourth Proportional to 87,862.60, 131,793.90 and 81,987.40

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Solution

The fourth proportional to 87,862.60, 131,793.90 and 81,987.40 is: 122,981.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,862.60 : 131,793.90 = 81,987.40 : x
  2. Step 2: Convert to fraction form
    87,862.60/131,793.90 = 81,987.40/x
  3. Step 3: Cross multiply
    87,862.60x = 131,793.90 × 81,987.40
  4. Step 4: Simplify right side
    87,862.60x = 10,805,439,196.86
  5. Step 5: Solve for x
    x = 10,805,439,196.86/87,862.60
  6. Step 6: Final answer
    x = 122,981.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.