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Finding the Fourth Proportional to 22.71, 31.17 and 20.55

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Solution

The fourth proportional to 22.71, 31.17 and 20.55 is: 28.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.71 : 31.17 = 20.55 : x
  2. Step 2: Convert to fraction form
    22.71/31.17 = 20.55/x
  3. Step 3: Cross multiply
    22.71x = 31.17 × 20.55
  4. Step 4: Simplify right side
    22.71x = 640.54
  5. Step 5: Solve for x
    x = 640.54/22.71
  6. Step 6: Final answer
    x = 28.21

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.