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Finding the Fourth Proportional to 11.92, 17.81 and 9.24

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Solution

The fourth proportional to 11.92, 17.81 and 9.24 is: 13.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.92 : 17.81 = 9.24 : x
  2. Step 2: Convert to fraction form
    11.92/17.81 = 9.24/x
  3. Step 3: Cross multiply
    11.92x = 17.81 × 9.24
  4. Step 4: Simplify right side
    11.92x = 164.56
  5. Step 5: Solve for x
    x = 164.56/11.92
  6. Step 6: Final answer
    x = 13.81

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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.