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Finding the Fourth Proportional to 408,671.12, 613,105.10 and 128,188.37

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Solution

The fourth proportional to 408,671.12, 613,105.10 and 128,188.37 is: 192,313.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,671.12 : 613,105.10 = 128,188.37 : x
  2. Step 2: Convert to fraction form
    408,671.12/613,105.10 = 128,188.37/x
  3. Step 3: Cross multiply
    408,671.12x = 613,105.10 × 128,188.37
  4. Step 4: Simplify right side
    408,671.12x = 78,592,944,780.21
  5. Step 5: Solve for x
    x = 78,592,944,780.21/408,671.12
  6. Step 6: Final answer
    x = 192,313.43

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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.