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Finding the Fourth Proportional to 87,687.70, 131,478.95 and 42,620.29

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Solution

The fourth proportional to 87,687.70, 131,478.95 and 42,620.29 is: 63,904.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,687.70 : 131,478.95 = 42,620.29 : x
  2. Step 2: Convert to fraction form
    87,687.70/131,478.95 = 42,620.29/x
  3. Step 3: Cross multiply
    87,687.70x = 131,478.95 × 42,620.29
  4. Step 4: Simplify right side
    87,687.70x = 5,603,670,755.75
  5. Step 5: Solve for x
    x = 5,603,670,755.75/87,687.70
  6. Step 6: Final answer
    x = 63,904.87

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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.