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Finding the Third Proportional to 84.38 and 126.88

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Solution

The third proportional to 84.38 and 126.88 is: 190.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.38 : 126.88 = 126.88 : x
  2. Step 2: Convert to fraction form
    84.38/126.88 = 126.88/x
  3. Step 3: Cross multiply
    84.38x = 126.88 × 126.88
  4. Step 4: Simplify right side
    84.38x = 16,097.27
  5. Step 5: Solve for x
    x = 16,097.27/84.38
  6. Step 6: Final answer
    x = 190.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.