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Finding the Fourth Proportional to 138,331.80, 207,472.59 and 48,387.78

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Solution

The fourth proportional to 138,331.80, 207,472.59 and 48,387.78 is: 72,572.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,331.80 : 207,472.59 = 48,387.78 : x
  2. Step 2: Convert to fraction form
    138,331.80/207,472.59 = 48,387.78/x
  3. Step 3: Cross multiply
    138,331.80x = 207,472.59 × 48,387.78
  4. Step 4: Simplify right side
    138,331.80x = 10,039,138,040.95
  5. Step 5: Solve for x
    x = 10,039,138,040.95/138,331.80
  6. Step 6: Final answer
    x = 72,572.89

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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.