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Finding the Fourth Proportional to 408,575.60, 612,863.32 and 128,115.44

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Solution

The fourth proportional to 408,575.60, 612,863.32 and 128,115.44 is: 192,173.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,575.60 : 612,863.32 = 128,115.44 : x
  2. Step 2: Convert to fraction form
    408,575.60/612,863.32 = 128,115.44/x
  3. Step 3: Cross multiply
    408,575.60x = 612,863.32 × 128,115.44
  4. Step 4: Simplify right side
    408,575.60x = 78,517,253,901.66
  5. Step 5: Solve for x
    x = 78,517,253,901.66/408,575.60
  6. Step 6: Final answer
    x = 192,173.13

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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.