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Finding the Fourth Proportional to 8.18, 12.20 and 7.97

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Solution

The fourth proportional to 8.18, 12.20 and 7.97 is: 11.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.18 : 12.20 = 7.97 : x
  2. Step 2: Convert to fraction form
    8.18/12.20 = 7.97/x
  3. Step 3: Cross multiply
    8.18x = 12.20 × 7.97
  4. Step 4: Simplify right side
    8.18x = 97.28
  5. Step 5: Solve for x
    x = 97.28/8.18
  6. Step 6: Final answer
    x = 11.90

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.