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Finding the Fourth Proportional to 138,499.20, 207,813.60 and 59,680.80

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Solution

The fourth proportional to 138,499.20, 207,813.60 and 59,680.80 is: 89,549.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,499.20 : 207,813.60 = 59,680.80 : x
  2. Step 2: Convert to fraction form
    138,499.20/207,813.60 = 59,680.80/x
  3. Step 3: Cross multiply
    138,499.20x = 207,813.60 × 59,680.80
  4. Step 4: Simplify right side
    138,499.20x = 12,402,481,898.88
  5. Step 5: Solve for x
    x = 12,402,481,898.88/138,499.20
  6. Step 6: Final answer
    x = 89,549.12

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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.