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Finding the Fourth Proportional to 87,640.80, 131,461.20 and 77,503.20

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Solution

The fourth proportional to 87,640.80, 131,461.20 and 77,503.20 is: 116,254.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,640.80 : 131,461.20 = 77,503.20 : x
  2. Step 2: Convert to fraction form
    87,640.80/131,461.20 = 77,503.20/x
  3. Step 3: Cross multiply
    87,640.80x = 131,461.20 × 77,503.20
  4. Step 4: Simplify right side
    87,640.80x = 10,188,663,675.84
  5. Step 5: Solve for x
    x = 10,188,663,675.84/87,640.80
  6. Step 6: Final answer
    x = 116,254.80

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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.