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Finding the Third Proportional to 81.16 and 133.13

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Solution

The third proportional to 81.16 and 133.13 is: 218.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.16 : 133.13 = 133.13 : x
  2. Step 2: Convert to fraction form
    81.16/133.13 = 133.13/x
  3. Step 3: Cross multiply
    81.16x = 133.13 × 133.13
  4. Step 4: Simplify right side
    81.16x = 17,723.05
  5. Step 5: Solve for x
    x = 17,723.05/81.16
  6. Step 6: Final answer
    x = 218.38

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Why These Related Problems?

These problems maintain the same ratio (1.64) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.