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Finding the Third Proportional to 3.11 and 3.99

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Solution

The third proportional to 3.11 and 3.99 is: 5.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.11 : 3.99 = 3.99 : x
  2. Step 2: Convert to fraction form
    3.11/3.99 = 3.99/x
  3. Step 3: Cross multiply
    3.11x = 3.99 × 3.99
  4. Step 4: Simplify right side
    3.11x = 15.93
  5. Step 5: Solve for x
    x = 15.93/3.11
  6. Step 6: Final answer
    x = 5.12

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Why These Related Problems?

These problems maintain the same ratio (1.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.