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Finding the Fourth Proportional to 391,090.97, 539,713.20 and 255,211.85

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Solution

The fourth proportional to 391,090.97, 539,713.20 and 255,211.85 is: 352,197.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,090.97 : 539,713.20 = 255,211.85 : x
  2. Step 2: Convert to fraction form
    391,090.97/539,713.20 = 255,211.85/x
  3. Step 3: Cross multiply
    391,090.97x = 539,713.20 × 255,211.85
  4. Step 4: Simplify right side
    391,090.97x = 137,741,204,241.42
  5. Step 5: Solve for x
    x = 137,741,204,241.42/391,090.97
  6. Step 6: Final answer
    x = 352,197.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.