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Finding the Fourth Proportional to 391,903.75, 587,886 and 121,997.98

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Solution

The fourth proportional to 391,903.75, 587,886 and 121,997.98 is: 183,006.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,903.75 : 587,886 = 121,997.98 : x
  2. Step 2: Convert to fraction form
    391,903.75/587,886 = 121,997.98/x
  3. Step 3: Cross multiply
    391,903.75x = 587,886 × 121,997.98
  4. Step 4: Simplify right side
    391,903.75x = 71,720,904,470.28
  5. Step 5: Solve for x
    x = 71,720,904,470.28/391,903.75
  6. Step 6: Final answer
    x = 183,006.43

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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.