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Finding the Fourth Proportional to 12.81, 17.66 and 11.19

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Solution

The fourth proportional to 12.81, 17.66 and 11.19 is: 15.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.81 : 17.66 = 11.19 : x
  2. Step 2: Convert to fraction form
    12.81/17.66 = 11.19/x
  3. Step 3: Cross multiply
    12.81x = 17.66 × 11.19
  4. Step 4: Simplify right side
    12.81x = 197.56
  5. Step 5: Solve for x
    x = 197.56/12.81
  6. Step 6: Final answer
    x = 15.42

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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.