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Finding the Third Proportional to 3.85 and 7.91

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Solution

The third proportional to 3.85 and 7.91 is: 16.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.85 : 7.91 = 7.91 : x
  2. Step 2: Convert to fraction form
    3.85/7.91 = 7.91/x
  3. Step 3: Cross multiply
    3.85x = 7.91 × 7.91
  4. Step 4: Simplify right side
    3.85x = 62.57
  5. Step 5: Solve for x
    x = 62.57/3.85
  6. Step 6: Final answer
    x = 16.25

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Why These Related Problems?

These problems maintain the same ratio (2.05) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.