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Finding the Fourth Proportional to 422,939.79, 634,470 and 138,569.55

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Solution

The fourth proportional to 422,939.79, 634,470 and 138,569.55 is: 207,874.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    422,939.79 : 634,470 = 138,569.55 : x
  2. Step 2: Convert to fraction form
    422,939.79/634,470 = 138,569.55/x
  3. Step 3: Cross multiply
    422,939.79x = 634,470 × 138,569.55
  4. Step 4: Simplify right side
    422,939.79x = 87,918,222,388.50
  5. Step 5: Solve for x
    x = 87,918,222,388.50/422,939.79
  6. Step 6: Final answer
    x = 207,874.09

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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.