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Finding the Fourth Proportional to 87,720.60, 131,472.90 and 59,640.60

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Solution

The fourth proportional to 87,720.60, 131,472.90 and 59,640.60 is: 89,387.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,720.60 : 131,472.90 = 59,640.60 : x
  2. Step 2: Convert to fraction form
    87,720.60/131,472.90 = 59,640.60/x
  3. Step 3: Cross multiply
    87,720.60x = 131,472.90 × 59,640.60
  4. Step 4: Simplify right side
    87,720.60x = 7,841,122,639.74
  5. Step 5: Solve for x
    x = 7,841,122,639.74/87,720.60
  6. Step 6: Final answer
    x = 89,387.47

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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.