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Finding the Third Proportional to 81.50 and 91

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Solution

The third proportional to 81.50 and 91 is: 101.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.50 : 91 = 91 : x
  2. Step 2: Convert to fraction form
    81.50/91 = 91/x
  3. Step 3: Cross multiply
    81.50x = 91 × 91
  4. Step 4: Simplify right side
    81.50x = 8,281
  5. Step 5: Solve for x
    x = 8,281/81.50
  6. Step 6: Final answer
    x = 101.61

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Why These Related Problems?

These problems maintain the same ratio (1.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.