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Finding the Fourth Proportional to 422,688.33, 634,129.65 and 138,388.05

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Solution

The fourth proportional to 422,688.33, 634,129.65 and 138,388.05 is: 207,613.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    422,688.33 : 634,129.65 = 138,388.05 : x
  2. Step 2: Convert to fraction form
    422,688.33/634,129.65 = 138,388.05/x
  3. Step 3: Cross multiply
    422,688.33x = 634,129.65 × 138,388.05
  4. Step 4: Simplify right side
    422,688.33x = 87,755,965,710.68
  5. Step 5: Solve for x
    x = 87,755,965,710.68/422,688.33
  6. Step 6: Final answer
    x = 207,613.88

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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.