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Finding the Fourth Proportional to 123,631.20, 185,269.20 and 76,856.80

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Solution

The fourth proportional to 123,631.20, 185,269.20 and 76,856.80 is: 115,174.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,631.20 : 185,269.20 = 76,856.80 : x
  2. Step 2: Convert to fraction form
    123,631.20/185,269.20 = 76,856.80/x
  3. Step 3: Cross multiply
    123,631.20x = 185,269.20 × 76,856.80
  4. Step 4: Simplify right side
    123,631.20x = 14,239,197,850.56
  5. Step 5: Solve for x
    x = 14,239,197,850.56/123,631.20
  6. Step 6: Final answer
    x = 115,174.79

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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.