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Finding the Fourth Proportional to 18.31, 27.48 and 13.85

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Solution

The fourth proportional to 18.31, 27.48 and 13.85 is: 20.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.31 : 27.48 = 13.85 : x
  2. Step 2: Convert to fraction form
    18.31/27.48 = 13.85/x
  3. Step 3: Cross multiply
    18.31x = 27.48 × 13.85
  4. Step 4: Simplify right side
    18.31x = 380.60
  5. Step 5: Solve for x
    x = 380.60/18.31
  6. Step 6: Final answer
    x = 20.79

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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.