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Finding the Fourth Proportional to 391,906.50, 587,890.13 and 122,000.73

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Solution

The fourth proportional to 391,906.50, 587,890.13 and 122,000.73 is: 183,010.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,906.50 : 587,890.13 = 122,000.73 : x
  2. Step 2: Convert to fraction form
    391,906.50/587,890.13 = 122,000.73/x
  3. Step 3: Cross multiply
    391,906.50x = 587,890.13 × 122,000.73
  4. Step 4: Simplify right side
    391,906.50x = 71,723,024,409.79
  5. Step 5: Solve for x
    x = 71,723,024,409.79/391,906.50
  6. Step 6: Final answer
    x = 183,010.55

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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.