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Finding the Fourth Proportional to 391,403.70, 587,105.55 and 256,101.30

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Solution

The fourth proportional to 391,403.70, 587,105.55 and 256,101.30 is: 384,151.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,403.70 : 587,105.55 = 256,101.30 : x
  2. Step 2: Convert to fraction form
    391,403.70/587,105.55 = 256,101.30/x
  3. Step 3: Cross multiply
    391,403.70x = 587,105.55 × 256,101.30
  4. Step 4: Simplify right side
    391,403.70x = 150,358,494,592.22
  5. Step 5: Solve for x
    x = 150,358,494,592.22/391,403.70
  6. Step 6: Final answer
    x = 384,151.95

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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.