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Finding the Fourth Proportional to 408,691.88, 613,037.10 and 128,208.68

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Solution

The fourth proportional to 408,691.88, 613,037.10 and 128,208.68 is: 192,312.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,691.88 : 613,037.10 = 128,208.68 : x
  2. Step 2: Convert to fraction form
    408,691.88/613,037.10 = 128,208.68/x
  3. Step 3: Cross multiply
    408,691.88x = 613,037.10 × 128,208.68
  4. Step 4: Simplify right side
    408,691.88x = 78,596,677,382.03
  5. Step 5: Solve for x
    x = 78,596,677,382.03/408,691.88
  6. Step 6: Final answer
    x = 192,312.79

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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.