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Finding the Third Proportional to 69.88 and 81.75

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Solution

The third proportional to 69.88 and 81.75 is: 95.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.88 : 81.75 = 81.75 : x
  2. Step 2: Convert to fraction form
    69.88/81.75 = 81.75/x
  3. Step 3: Cross multiply
    69.88x = 81.75 × 81.75
  4. Step 4: Simplify right side
    69.88x = 6,683.06
  5. Step 5: Solve for x
    x = 6,683.06/69.88
  6. Step 6: Final answer
    x = 95.64

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Why These Related Problems?

These problems maintain the same ratio (1.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.