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Finding the Fourth Proportional to 71,809.20, 107,691.12 and 66,472.92

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Solution

The fourth proportional to 71,809.20, 107,691.12 and 66,472.92 is: 99,688.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,809.20 : 107,691.12 = 66,472.92 : x
  2. Step 2: Convert to fraction form
    71,809.20/107,691.12 = 66,472.92/x
  3. Step 3: Cross multiply
    71,809.20x = 107,691.12 × 66,472.92
  4. Step 4: Simplify right side
    71,809.20x = 7,158,543,204.47
  5. Step 5: Solve for x
    x = 7,158,543,204.47/71,809.20
  6. Step 6: Final answer
    x = 99,688.39

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1.5x scale

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.