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Finding the Fourth Proportional to 11.10, 15.31 and 8.68

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Solution

The fourth proportional to 11.10, 15.31 and 8.68 is: 11.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.10 : 15.31 = 8.68 : x
  2. Step 2: Convert to fraction form
    11.10/15.31 = 8.68/x
  3. Step 3: Cross multiply
    11.10x = 15.31 × 8.68
  4. Step 4: Simplify right side
    11.10x = 132.89
  5. Step 5: Solve for x
    x = 132.89/11.10
  6. Step 6: Final answer
    x = 11.97

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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.