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Finding the Fourth Proportional to 391,379.86, 587,142.69 and 125,207.38

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Solution

The fourth proportional to 391,379.86, 587,142.69 and 125,207.38 is: 187,834.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,379.86 : 587,142.69 = 125,207.38 : x
  2. Step 2: Convert to fraction form
    391,379.86/587,142.69 = 125,207.38/x
  3. Step 3: Cross multiply
    391,379.86x = 587,142.69 × 125,207.38
  4. Step 4: Simplify right side
    391,379.86x = 73,514,597,901.05
  5. Step 5: Solve for x
    x = 73,514,597,901.05/391,379.86
  6. Step 6: Final answer
    x = 187,834.39

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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.