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Finding the Fourth Proportional to 259,939.80, 389,909.70 and 72,951.30

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Solution

The fourth proportional to 259,939.80, 389,909.70 and 72,951.30 is: 109,426.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,939.80 : 389,909.70 = 72,951.30 : x
  2. Step 2: Convert to fraction form
    259,939.80/389,909.70 = 72,951.30/x
  3. Step 3: Cross multiply
    259,939.80x = 389,909.70 × 72,951.30
  4. Step 4: Simplify right side
    259,939.80x = 28,444,419,497.61
  5. Step 5: Solve for x
    x = 28,444,419,497.61/259,939.80
  6. Step 6: Final answer
    x = 109,426.95

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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.