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Finding the Third Proportional to 20,390 and 31,349

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Solution

The third proportional to 20,390 and 31,349 is: 48,198.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390 : 31,349 = 31,349 : x
  2. Step 2: Convert to fraction form
    20,390/31,349 = 31,349/x
  3. Step 3: Cross multiply
    20,390x = 31,349 × 31,349
  4. Step 4: Simplify right side
    20,390x = 982,759,801
  5. Step 5: Solve for x
    x = 982,759,801/20,390
  6. Step 6: Final answer
    x = 48,198.13

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.