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Finding the Third Proportional to 31.75 and 80.75

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Solution

The third proportional to 31.75 and 80.75 is: 205.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.75 : 80.75 = 80.75 : x
  2. Step 2: Convert to fraction form
    31.75/80.75 = 80.75/x
  3. Step 3: Cross multiply
    31.75x = 80.75 × 80.75
  4. Step 4: Simplify right side
    31.75x = 6,520.56
  5. Step 5: Solve for x
    x = 6,520.56/31.75
  6. Step 6: Final answer
    x = 205.37

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Why These Related Problems?

These problems maintain the same ratio (2.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.