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Finding the Third Proportional to 18,708.75 and 20,439

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Solution

The third proportional to 18,708.75 and 20,439 is: 22,329.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,708.75 : 20,439 = 20,439 : x
  2. Step 2: Convert to fraction form
    18,708.75/20,439 = 20,439/x
  3. Step 3: Cross multiply
    18,708.75x = 20,439 × 20,439
  4. Step 4: Simplify right side
    18,708.75x = 417,752,721
  5. Step 5: Solve for x
    x = 417,752,721/18,708.75
  6. Step 6: Final answer
    x = 22,329.27

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.