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Finding the Fourth Proportional to 7.97, 11.79 and 7.92

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Solution

The fourth proportional to 7.97, 11.79 and 7.92 is: 11.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.97 : 11.79 = 7.92 : x
  2. Step 2: Convert to fraction form
    7.97/11.79 = 7.92/x
  3. Step 3: Cross multiply
    7.97x = 11.79 × 7.92
  4. Step 4: Simplify right side
    7.97x = 93.38
  5. Step 5: Solve for x
    x = 93.38/7.97
  6. Step 6: Final answer
    x = 11.72

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.