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Finding the Fourth Proportional to 22.71, 31.32 and 20.97

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Solution

The fourth proportional to 22.71, 31.32 and 20.97 is: 28.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.71 : 31.32 = 20.97 : x
  2. Step 2: Convert to fraction form
    22.71/31.32 = 20.97/x
  3. Step 3: Cross multiply
    22.71x = 31.32 × 20.97
  4. Step 4: Simplify right side
    22.71x = 656.78
  5. Step 5: Solve for x
    x = 656.78/22.71
  6. Step 6: Final answer
    x = 28.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.