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Finding the Fourth Proportional to 20.27, 30.24 and 18.86

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Solution

The fourth proportional to 20.27, 30.24 and 18.86 is: 28.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.27 : 30.24 = 18.86 : x
  2. Step 2: Convert to fraction form
    20.27/30.24 = 18.86/x
  3. Step 3: Cross multiply
    20.27x = 30.24 × 18.86
  4. Step 4: Simplify right side
    20.27x = 570.18
  5. Step 5: Solve for x
    x = 570.18/20.27
  6. Step 6: Final answer
    x = 28.13

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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.