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Finding the Fourth Proportional to 391,511.60, 587,306.16 and 125,205.20

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Solution

The fourth proportional to 391,511.60, 587,306.16 and 125,205.20 is: 187,820.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,511.60 : 587,306.16 = 125,205.20 : x
  2. Step 2: Convert to fraction form
    391,511.60/587,306.16 = 125,205.20/x
  3. Step 3: Cross multiply
    391,511.60x = 587,306.16 × 125,205.20
  4. Step 4: Simplify right side
    391,511.60x = 73,533,785,224.03
  5. Step 5: Solve for x
    x = 73,533,785,224.03/391,511.60
  6. Step 6: Final answer
    x = 187,820.20

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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.