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Finding the Fourth Proportional to 391,230.20, 587,234.10 and 191,775.80

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Solution

The fourth proportional to 391,230.20, 587,234.10 and 191,775.80 is: 287,854.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,230.20 : 587,234.10 = 191,775.80 : x
  2. Step 2: Convert to fraction form
    391,230.20/587,234.10 = 191,775.80/x
  3. Step 3: Cross multiply
    391,230.20x = 587,234.10 × 191,775.80
  4. Step 4: Simplify right side
    391,230.20x = 112,617,289,314.78
  5. Step 5: Solve for x
    x = 112,617,289,314.78/391,230.20
  6. Step 6: Final answer
    x = 287,854.28

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1.5x scale

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.