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Finding the Third Proportional to 12.71 and 20.45

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Solution

The third proportional to 12.71 and 20.45 is: 32.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.71 : 20.45 = 20.45 : x
  2. Step 2: Convert to fraction form
    12.71/20.45 = 20.45/x
  3. Step 3: Cross multiply
    12.71x = 20.45 × 20.45
  4. Step 4: Simplify right side
    12.71x = 418.38
  5. Step 5: Solve for x
    x = 418.38/12.71
  6. Step 6: Final answer
    x = 32.92

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Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.