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Finding the Third Proportional to 128,450 and 170,439

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Solution

The third proportional to 128,450 and 170,439 is: 226,153.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,450 : 170,439 = 170,439 : x
  2. Step 2: Convert to fraction form
    128,450/170,439 = 170,439/x
  3. Step 3: Cross multiply
    128,450x = 170,439 × 170,439
  4. Step 4: Simplify right side
    128,450x = 29,049,452,721
  5. Step 5: Solve for x
    x = 29,049,452,721/128,450
  6. Step 6: Final answer
    x = 226,153.78

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.