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Finding the Fourth Proportional to 408,788.52, 613,281.24 and 128,305.68

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Solution

The fourth proportional to 408,788.52, 613,281.24 and 128,305.68 is: 192,489.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,788.52 : 613,281.24 = 128,305.68 : x
  2. Step 2: Convert to fraction form
    408,788.52/613,281.24 = 128,305.68/x
  3. Step 3: Cross multiply
    408,788.52x = 613,281.24 × 128,305.68
  4. Step 4: Simplify right side
    408,788.52x = 78,687,466,529.44
  5. Step 5: Solve for x
    x = 78,687,466,529.44/408,788.52
  6. Step 6: Final answer
    x = 192,489.42

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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.