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Finding the Fourth Proportional to 9.35, 13.98 and 7.91

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Solution

The fourth proportional to 9.35, 13.98 and 7.91 is: 11.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.35 : 13.98 = 7.91 : x
  2. Step 2: Convert to fraction form
    9.35/13.98 = 7.91/x
  3. Step 3: Cross multiply
    9.35x = 13.98 × 7.91
  4. Step 4: Simplify right side
    9.35x = 110.58
  5. Step 5: Solve for x
    x = 110.58/9.35
  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.