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Finding the Fourth Proportional to 22.25, 33.49 and 20.39

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Solution

The fourth proportional to 22.25, 33.49 and 20.39 is: 30.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.25 : 33.49 = 20.39 : x
  2. Step 2: Convert to fraction form
    22.25/33.49 = 20.39/x
  3. Step 3: Cross multiply
    22.25x = 33.49 × 20.39
  4. Step 4: Simplify right side
    22.25x = 682.86
  5. Step 5: Solve for x
    x = 682.86/22.25
  6. Step 6: Final answer
    x = 30.69

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.