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Finding the Third Proportional to 128,800 and 189,474

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Solution

The third proportional to 128,800 and 189,474 is: 278,729.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,800 : 189,474 = 189,474 : x
  2. Step 2: Convert to fraction form
    128,800/189,474 = 189,474/x
  3. Step 3: Cross multiply
    128,800x = 189,474 × 189,474
  4. Step 4: Simplify right side
    128,800x = 35,900,396,676
  5. Step 5: Solve for x
    x = 35,900,396,676/128,800
  6. Step 6: Final answer
    x = 278,729.79

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.