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Finding the Third Proportional to 3.99 and 8.68

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Solution

The third proportional to 3.99 and 8.68 is: 18.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.99 : 8.68 = 8.68 : x
  2. Step 2: Convert to fraction form
    3.99/8.68 = 8.68/x
  3. Step 3: Cross multiply
    3.99x = 8.68 × 8.68
  4. Step 4: Simplify right side
    3.99x = 75.33
  5. Step 5: Solve for x
    x = 75.33/3.99
  6. Step 6: Final answer
    x = 18.87

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.