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Finding the Fourth Proportional to 81,691.28, 122,469.96 and 29,070.80

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Solution

The fourth proportional to 81,691.28, 122,469.96 and 29,070.80 is: 43,582.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,691.28 : 122,469.96 = 29,070.80 : x
  2. Step 2: Convert to fraction form
    81,691.28/122,469.96 = 29,070.80/x
  3. Step 3: Cross multiply
    81,691.28x = 122,469.96 × 29,070.80
  4. Step 4: Simplify right side
    81,691.28x = 3,560,299,713.17
  5. Step 5: Solve for x
    x = 3,560,299,713.17/81,691.28
  6. Step 6: Final answer
    x = 43,582.37

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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.