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Finding the Third Proportional to 3.99 and 8.62

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Solution

The third proportional to 3.99 and 8.62 is: 18.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.99 : 8.62 = 8.62 : x
  2. Step 2: Convert to fraction form
    3.99/8.62 = 8.62/x
  3. Step 3: Cross multiply
    3.99x = 8.62 × 8.62
  4. Step 4: Simplify right side
    3.99x = 74.34
  5. Step 5: Solve for x
    x = 74.34/3.99
  6. Step 6: Final answer
    x = 18.61

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.