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Finding the Fourth Proportional to 18.11, 27.20 and 15.55

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Solution

The fourth proportional to 18.11, 27.20 and 15.55 is: 23.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.11 : 27.20 = 15.55 : x
  2. Step 2: Convert to fraction form
    18.11/27.20 = 15.55/x
  3. Step 3: Cross multiply
    18.11x = 27.20 × 15.55
  4. Step 4: Simplify right side
    18.11x = 422.93
  5. Step 5: Solve for x
    x = 422.93/18.11
  6. Step 6: Final answer
    x = 23.35

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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.