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Finding the Fourth Proportional to 128,112.60, 192,168.90 and 86,122.20

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Solution

The fourth proportional to 128,112.60, 192,168.90 and 86,122.20 is: 129,183.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,112.60 : 192,168.90 = 86,122.20 : x
  2. Step 2: Convert to fraction form
    128,112.60/192,168.90 = 86,122.20/x
  3. Step 3: Cross multiply
    128,112.60x = 192,168.90 × 86,122.20
  4. Step 4: Simplify right side
    128,112.60x = 16,550,008,439.58
  5. Step 5: Solve for x
    x = 16,550,008,439.58/128,112.60
  6. Step 6: Final answer
    x = 129,183.30

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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.