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Finding the Fourth Proportional to 638,520.40, 957,780.60 and 217,694.80

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Solution

The fourth proportional to 638,520.40, 957,780.60 and 217,694.80 is: 326,542.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,520.40 : 957,780.60 = 217,694.80 : x
  2. Step 2: Convert to fraction form
    638,520.40/957,780.60 = 217,694.80/x
  3. Step 3: Cross multiply
    638,520.40x = 957,780.60 × 217,694.80
  4. Step 4: Simplify right side
    638,520.40x = 208,503,856,160.88
  5. Step 5: Solve for x
    x = 208,503,856,160.88/638,520.40
  6. Step 6: Final answer
    x = 326,542.20

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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.