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Finding the Fourth Proportional to 13.97, 19.20 and 11.81

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Solution

The fourth proportional to 13.97, 19.20 and 11.81 is: 16.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.97 : 19.20 = 11.81 : x
  2. Step 2: Convert to fraction form
    13.97/19.20 = 11.81/x
  3. Step 3: Cross multiply
    13.97x = 19.20 × 11.81
  4. Step 4: Simplify right side
    13.97x = 226.69
  5. Step 5: Solve for x
    x = 226.69/13.97
  6. Step 6: Final answer
    x = 16.23

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.