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Finding the Fourth Proportional to 391,245.90, 587,086.89 and 211,327.68

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Solution

The fourth proportional to 391,245.90, 587,086.89 and 211,327.68 is: 317,109.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,245.90 : 587,086.89 = 211,327.68 : x
  2. Step 2: Convert to fraction form
    391,245.90/587,086.89 = 211,327.68/x
  3. Step 3: Cross multiply
    391,245.90x = 587,086.89 × 211,327.68
  4. Step 4: Simplify right side
    391,245.90x = 124,067,711,831.21
  5. Step 5: Solve for x
    x = 124,067,711,831.21/391,245.90
  6. Step 6: Final answer
    x = 317,109.30

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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.