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Finding the Third Proportional to 19,208 and 20,872

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Solution

The third proportional to 19,208 and 20,872 is: 22,680.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,208 : 20,872 = 20,872 : x
  2. Step 2: Convert to fraction form
    19,208/20,872 = 20,872/x
  3. Step 3: Cross multiply
    19,208x = 20,872 × 20,872
  4. Step 4: Simplify right side
    19,208x = 435,640,384
  5. Step 5: Solve for x
    x = 435,640,384/19,208
  6. Step 6: Final answer
    x = 22,680.15

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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.