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Finding the Third Proportional to 20,187 and 31,257

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Solution

The third proportional to 20,187 and 31,257 is: 48,397.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,187 : 31,257 = 31,257 : x
  2. Step 2: Convert to fraction form
    20,187/31,257 = 31,257/x
  3. Step 3: Cross multiply
    20,187x = 31,257 × 31,257
  4. Step 4: Simplify right side
    20,187x = 977,000,049
  5. Step 5: Solve for x
    x = 977,000,049/20,187
  6. Step 6: Final answer
    x = 48,397.49

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.