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Finding the Fourth Proportional to 263,260.60, 394,890.90 and 85,765.30

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Solution

The fourth proportional to 263,260.60, 394,890.90 and 85,765.30 is: 128,647.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    263,260.60 : 394,890.90 = 85,765.30 : x
  2. Step 2: Convert to fraction form
    263,260.60/394,890.90 = 85,765.30/x
  3. Step 3: Cross multiply
    263,260.60x = 394,890.90 × 85,765.30
  4. Step 4: Simplify right side
    263,260.60x = 33,867,936,505.77
  5. Step 5: Solve for x
    x = 33,867,936,505.77/263,260.60
  6. Step 6: Final answer
    x = 128,647.95

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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.