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Finding the Fourth Proportional to 128,610.20, 192,800.10 and 84,258.20

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Solution

The fourth proportional to 128,610.20, 192,800.10 and 84,258.20 is: 126,311.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,610.20 : 192,800.10 = 84,258.20 : x
  2. Step 2: Convert to fraction form
    128,610.20/192,800.10 = 84,258.20/x
  3. Step 3: Cross multiply
    128,610.20x = 192,800.10 × 84,258.20
  4. Step 4: Simplify right side
    128,610.20x = 16,244,989,385.82
  5. Step 5: Solve for x
    x = 16,244,989,385.82/128,610.20
  6. Step 6: Final answer
    x = 126,311.83

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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.