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Finding the Third Proportional to 5.18 and 7.92

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Solution

The third proportional to 5.18 and 7.92 is: 12.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.18 : 7.92 = 7.92 : x
  2. Step 2: Convert to fraction form
    5.18/7.92 = 7.92/x
  3. Step 3: Cross multiply
    5.18x = 7.92 × 7.92
  4. Step 4: Simplify right side
    5.18x = 62.65
  5. Step 5: Solve for x
    x = 62.65/5.18
  6. Step 6: Final answer
    x = 12.11

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.