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Finding the Fourth Proportional to 619,720.70, 929,581.05 and 220,811.90

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Solution

The fourth proportional to 619,720.70, 929,581.05 and 220,811.90 is: 331,217.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,720.70 : 929,581.05 = 220,811.90 : x
  2. Step 2: Convert to fraction form
    619,720.70/929,581.05 = 220,811.90/x
  3. Step 3: Cross multiply
    619,720.70x = 929,581.05 × 220,811.90
  4. Step 4: Simplify right side
    619,720.70x = 205,262,557,854.50
  5. Step 5: Solve for x
    x = 205,262,557,854.50/619,720.70
  6. Step 6: Final answer
    x = 331,217.85

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Double scale
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Similar ratio
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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.