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Finding the Fourth Proportional to 408,789.36, 613,189.51 and 128,306.61

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Solution

The fourth proportional to 408,789.36, 613,189.51 and 128,306.61 is: 192,461.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,789.36 : 613,189.51 = 128,306.61 : x
  2. Step 2: Convert to fraction form
    408,789.36/613,189.51 = 128,306.61/x
  3. Step 3: Cross multiply
    408,789.36x = 613,189.51 × 128,306.61
  4. Step 4: Simplify right side
    408,789.36x = 78,676,267,481.11
  5. Step 5: Solve for x
    x = 78,676,267,481.11/408,789.36
  6. Step 6: Final answer
    x = 192,461.63

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1.5x scale

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.