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Finding the Fourth Proportional to 128,451.60, 192,660.39 and 58,314.78

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Solution

The fourth proportional to 128,451.60, 192,660.39 and 58,314.78 is: 87,464.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,451.60 : 192,660.39 = 58,314.78 : x
  2. Step 2: Convert to fraction form
    128,451.60/192,660.39 = 58,314.78/x
  3. Step 3: Cross multiply
    128,451.60x = 192,660.39 × 58,314.78
  4. Step 4: Simplify right side
    128,451.60x = 11,234,948,257.56
  5. Step 5: Solve for x
    x = 11,234,948,257.56/128,451.60
  6. Step 6: Final answer
    x = 87,464.45

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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.