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Finding the Fourth Proportional to 391,778.88, 587,742.08 and 279,179.76

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Solution

The fourth proportional to 391,778.88, 587,742.08 and 279,179.76 is: 418,822.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,778.88 : 587,742.08 = 279,179.76 : x
  2. Step 2: Convert to fraction form
    391,778.88/587,742.08 = 279,179.76/x
  3. Step 3: Cross multiply
    391,778.88x = 587,742.08 × 279,179.76
  4. Step 4: Simplify right side
    391,778.88x = 164,085,693,644.44
  5. Step 5: Solve for x
    x = 164,085,693,644.44/391,778.88
  6. Step 6: Final answer
    x = 418,822.21

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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.