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Finding the Third Proportional to 87.75 and 109.97

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Solution

The third proportional to 87.75 and 109.97 is: 137.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.75 : 109.97 = 109.97 : x
  2. Step 2: Convert to fraction form
    87.75/109.97 = 109.97/x
  3. Step 3: Cross multiply
    87.75x = 109.97 × 109.97
  4. Step 4: Simplify right side
    87.75x = 12,093.13
  5. Step 5: Solve for x
    x = 12,093.13/87.75
  6. Step 6: Final answer
    x = 137.81

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Why These Related Problems?

These problems maintain the same ratio (1.25) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.