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Finding the Fourth Proportional to 138,040.80, 207,279.90 and 100,861.80

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Solution

The fourth proportional to 138,040.80, 207,279.90 and 100,861.80 is: 151,452.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,040.80 : 207,279.90 = 100,861.80 : x
  2. Step 2: Convert to fraction form
    138,040.80/207,279.90 = 100,861.80/x
  3. Step 3: Cross multiply
    138,040.80x = 207,279.90 × 100,861.80
  4. Step 4: Simplify right side
    138,040.80x = 20,906,623,817.82
  5. Step 5: Solve for x
    x = 20,906,623,817.82/138,040.80
  6. Step 6: Final answer
    x = 151,452.50

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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.