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Finding the Fourth Proportional to 422,687.83, 634,128.90 and 138,387.55

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Solution

The fourth proportional to 422,687.83, 634,128.90 and 138,387.55 is: 207,613.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    422,687.83 : 634,128.90 = 138,387.55 : x
  2. Step 2: Convert to fraction form
    422,687.83/634,128.90 = 138,387.55/x
  3. Step 3: Cross multiply
    422,687.83x = 634,128.90 × 138,387.55
  4. Step 4: Simplify right side
    422,687.83x = 87,755,544,855.20
  5. Step 5: Solve for x
    x = 87,755,544,855.20/422,687.83
  6. Step 6: Final answer
    x = 207,613.13

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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.