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Finding the Third Proportional to 3.87 and 6.89

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Solution

The third proportional to 3.87 and 6.89 is: 12.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.87 : 6.89 = 6.89 : x
  2. Step 2: Convert to fraction form
    3.87/6.89 = 6.89/x
  3. Step 3: Cross multiply
    3.87x = 6.89 × 6.89
  4. Step 4: Simplify right side
    3.87x = 47.48
  5. Step 5: Solve for x
    x = 47.48/3.87
  6. Step 6: Final answer
    x = 12.28

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Why These Related Problems?

These problems maintain the same ratio (1.78) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.