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Finding the Third Proportional to 69.25 and 91.88

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Solution

The third proportional to 69.25 and 91.88 is: 121.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.25 : 91.88 = 91.88 : x
  2. Step 2: Convert to fraction form
    69.25/91.88 = 91.88/x
  3. Step 3: Cross multiply
    69.25x = 91.88 × 91.88
  4. Step 4: Simplify right side
    69.25x = 8,441.02
  5. Step 5: Solve for x
    x = 8,441.02/69.25
  6. Step 6: Final answer
    x = 121.89

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.