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Finding the Third Proportional to 20,920 and 31,427

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Solution

The third proportional to 20,920 and 31,427 is: 47,211.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920 : 31,427 = 31,427 : x
  2. Step 2: Convert to fraction form
    20,920/31,427 = 31,427/x
  3. Step 3: Cross multiply
    20,920x = 31,427 × 31,427
  4. Step 4: Simplify right side
    20,920x = 987,656,329
  5. Step 5: Solve for x
    x = 987,656,329/20,920
  6. Step 6: Final answer
    x = 47,211.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.