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Finding the Third Proportional to 11,920 and 15,675

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Solution

The third proportional to 11,920 and 15,675 is: 20,612.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,920 : 15,675 = 15,675 : x
  2. Step 2: Convert to fraction form
    11,920/15,675 = 15,675/x
  3. Step 3: Cross multiply
    11,920x = 15,675 × 15,675
  4. Step 4: Simplify right side
    11,920x = 245,705,625
  5. Step 5: Solve for x
    x = 245,705,625/11,920
  6. Step 6: Final answer
    x = 20,612.89

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Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.