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Finding the Fourth Proportional to 11.09, 15.31 and 8.66

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Solution

The fourth proportional to 11.09, 15.31 and 8.66 is: 11.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.09 : 15.31 = 8.66 : x
  2. Step 2: Convert to fraction form
    11.09/15.31 = 8.66/x
  3. Step 3: Cross multiply
    11.09x = 15.31 × 8.66
  4. Step 4: Simplify right side
    11.09x = 132.58
  5. Step 5: Solve for x
    x = 132.58/11.09
  6. Step 6: Final answer
    x = 11.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.