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Finding the Third Proportional to 12.91 and 28.13

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Solution

The third proportional to 12.91 and 28.13 is: 61.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.91 : 28.13 = 28.13 : x
  2. Step 2: Convert to fraction form
    12.91/28.13 = 28.13/x
  3. Step 3: Cross multiply
    12.91x = 28.13 × 28.13
  4. Step 4: Simplify right side
    12.91x = 791.39
  5. Step 5: Solve for x
    x = 791.39/12.91
  6. Step 6: Final answer
    x = 61.28

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.