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Finding the Fourth Proportional to 87,150.80, 130,726.20 and 81,245.90

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Solution

The fourth proportional to 87,150.80, 130,726.20 and 81,245.90 is: 121,868.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,150.80 : 130,726.20 = 81,245.90 : x
  2. Step 2: Convert to fraction form
    87,150.80/130,726.20 = 81,245.90/x
  3. Step 3: Cross multiply
    87,150.80x = 130,726.20 × 81,245.90
  4. Step 4: Simplify right side
    87,150.80x = 10,620,967,772.58
  5. Step 5: Solve for x
    x = 10,620,967,772.58/87,150.80
  6. Step 6: Final answer
    x = 121,868.85

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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.