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Finding the Third Proportional to 115.25 and 126.88

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Solution

The third proportional to 115.25 and 126.88 is: 139.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.25 : 126.88 = 126.88 : x
  2. Step 2: Convert to fraction form
    115.25/126.88 = 126.88/x
  3. Step 3: Cross multiply
    115.25x = 126.88 × 126.88
  4. Step 4: Simplify right side
    115.25x = 16,097.27
  5. Step 5: Solve for x
    x = 16,097.27/115.25
  6. Step 6: Final answer
    x = 139.67

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Why These Related Problems?

These problems maintain the same ratio (1.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.