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Finding the Third Proportional to 12.97 and 20.09

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Solution

The third proportional to 12.97 and 20.09 is: 31.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.97 : 20.09 = 20.09 : x
  2. Step 2: Convert to fraction form
    12.97/20.09 = 20.09/x
  3. Step 3: Cross multiply
    12.97x = 20.09 × 20.09
  4. Step 4: Simplify right side
    12.97x = 403.68
  5. Step 5: Solve for x
    x = 403.68/12.97
  6. Step 6: Final answer
    x = 31.12

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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.