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Finding the Fourth Proportional to 7.91, 11.88 and 7.88

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Solution

The fourth proportional to 7.91, 11.88 and 7.88 is: 11.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.91 : 11.88 = 7.88 : x
  2. Step 2: Convert to fraction form
    7.91/11.88 = 7.88/x
  3. Step 3: Cross multiply
    7.91x = 11.88 × 7.88
  4. Step 4: Simplify right side
    7.91x = 93.61
  5. Step 5: Solve for x
    x = 93.61/7.91
  6. Step 6: Final answer
    x = 11.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.