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Finding the Third Proportional to 67.88 and 87.38

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Solution

The third proportional to 67.88 and 87.38 is: 112.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.88 : 87.38 = 87.38 : x
  2. Step 2: Convert to fraction form
    67.88/87.38 = 87.38/x
  3. Step 3: Cross multiply
    67.88x = 87.38 × 87.38
  4. Step 4: Simplify right side
    67.88x = 7,634.39
  5. Step 5: Solve for x
    x = 7,634.39/67.88
  6. Step 6: Final answer
    x = 112.48

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Why These Related Problems?

These problems maintain the same ratio (1.29) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.