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Finding the Fourth Proportional to 11.81, 17.61 and 10.66

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Solution

The fourth proportional to 11.81, 17.61 and 10.66 is: 15.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.81 : 17.61 = 10.66 : x
  2. Step 2: Convert to fraction form
    11.81/17.61 = 10.66/x
  3. Step 3: Cross multiply
    11.81x = 17.61 × 10.66
  4. Step 4: Simplify right side
    11.81x = 187.72
  5. Step 5: Solve for x
    x = 187.72/11.81
  6. Step 6: Final answer
    x = 15.90

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.