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Finding the Fourth Proportional to 391,338.28, 587,119.50 and 191,717.12

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Solution

The fourth proportional to 391,338.28, 587,119.50 and 191,717.12 is: 287,630.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,338.28 : 587,119.50 = 191,717.12 : x
  2. Step 2: Convert to fraction form
    391,338.28/587,119.50 = 191,717.12/x
  3. Step 3: Cross multiply
    391,338.28x = 587,119.50 × 191,717.12
  4. Step 4: Simplify right side
    391,338.28x = 112,560,861,103.64
  5. Step 5: Solve for x
    x = 112,560,861,103.64/391,338.28
  6. Step 6: Final answer
    x = 287,630.59

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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.