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Finding the Fourth Proportional to 13.11, 18.09 and 7.66

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Solution

The fourth proportional to 13.11, 18.09 and 7.66 is: 10.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.11 : 18.09 = 7.66 : x
  2. Step 2: Convert to fraction form
    13.11/18.09 = 7.66/x
  3. Step 3: Cross multiply
    13.11x = 18.09 × 7.66
  4. Step 4: Simplify right side
    13.11x = 138.50
  5. Step 5: Solve for x
    x = 138.50/13.11
  6. Step 6: Final answer
    x = 10.56

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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.