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Finding the Fourth Proportional to 20.27, 30.39 and 15.18

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Solution

The fourth proportional to 20.27, 30.39 and 15.18 is: 22.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.27 : 30.39 = 15.18 : x
  2. Step 2: Convert to fraction form
    20.27/30.39 = 15.18/x
  3. Step 3: Cross multiply
    20.27x = 30.39 × 15.18
  4. Step 4: Simplify right side
    20.27x = 461.32
  5. Step 5: Solve for x
    x = 461.32/20.27
  6. Step 6: Final answer
    x = 22.76

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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.