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Finding the Fourth Proportional to 11.89, 17.84 and 9.91

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Solution

The fourth proportional to 11.89, 17.84 and 9.91 is: 14.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.89 : 17.84 = 9.91 : x
  2. Step 2: Convert to fraction form
    11.89/17.84 = 9.91/x
  3. Step 3: Cross multiply
    11.89x = 17.84 × 9.91
  4. Step 4: Simplify right side
    11.89x = 176.79
  5. Step 5: Solve for x
    x = 176.79/11.89
  6. Step 6: Final answer
    x = 14.87

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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.