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Finding the Fourth Proportional to 87,686.56, 131,529.88 and 81,388

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Solution

The fourth proportional to 87,686.56, 131,529.88 and 81,388 is: 122,082.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,686.56 : 131,529.88 = 81,388 : x
  2. Step 2: Convert to fraction form
    87,686.56/131,529.88 = 81,388/x
  3. Step 3: Cross multiply
    87,686.56x = 131,529.88 × 81,388
  4. Step 4: Simplify right side
    87,686.56x = 10,704,953,873.44
  5. Step 5: Solve for x
    x = 10,704,953,873.44/87,686.56
  6. Step 6: Final answer
    x = 122,082.04

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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.