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Finding the Third Proportional to 20,122 and 31,397

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Solution

The third proportional to 20,122 and 31,397 is: 48,989.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,122 : 31,397 = 31,397 : x
  2. Step 2: Convert to fraction form
    20,122/31,397 = 31,397/x
  3. Step 3: Cross multiply
    20,122x = 31,397 × 31,397
  4. Step 4: Simplify right side
    20,122x = 985,771,609
  5. Step 5: Solve for x
    x = 985,771,609/20,122
  6. Step 6: Final answer
    x = 48,989.74

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.