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Finding the Fourth Proportional to 18.38, 27.49 and 13.24

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Solution

The fourth proportional to 18.38, 27.49 and 13.24 is: 19.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.38 : 27.49 = 13.24 : x
  2. Step 2: Convert to fraction form
    18.38/27.49 = 13.24/x
  3. Step 3: Cross multiply
    18.38x = 27.49 × 13.24
  4. Step 4: Simplify right side
    18.38x = 363.87
  5. Step 5: Solve for x
    x = 363.87/18.38
  6. Step 6: Final answer
    x = 19.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.