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Finding the Third Proportional to 12,920 and 16,872

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Solution

The third proportional to 12,920 and 16,872 is: 22,032.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,920 : 16,872 = 16,872 : x
  2. Step 2: Convert to fraction form
    12,920/16,872 = 16,872/x
  3. Step 3: Cross multiply
    12,920x = 16,872 × 16,872
  4. Step 4: Simplify right side
    12,920x = 284,664,384
  5. Step 5: Solve for x
    x = 284,664,384/12,920
  6. Step 6: Final answer
    x = 22,032.85

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.