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Finding the Fourth Proportional to 408,286.70, 612,390.45 and 123,979.71

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Solution

The fourth proportional to 408,286.70, 612,390.45 and 123,979.71 is: 185,957.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,286.70 : 612,390.45 = 123,979.71 : x
  2. Step 2: Convert to fraction form
    408,286.70/612,390.45 = 123,979.71/x
  3. Step 3: Cross multiply
    408,286.70x = 612,390.45 × 123,979.71
  4. Step 4: Simplify right side
    408,286.70x = 75,923,990,397.77
  5. Step 5: Solve for x
    x = 75,923,990,397.77/408,286.70
  6. Step 6: Final answer
    x = 185,957.54

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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.