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Finding the Fourth Proportional to 22.28, 33.18 and 21.36

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Solution

The fourth proportional to 22.28, 33.18 and 21.36 is: 31.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.28 : 33.18 = 21.36 : x
  2. Step 2: Convert to fraction form
    22.28/33.18 = 21.36/x
  3. Step 3: Cross multiply
    22.28x = 33.18 × 21.36
  4. Step 4: Simplify right side
    22.28x = 708.72
  5. Step 5: Solve for x
    x = 708.72/22.28
  6. Step 6: Final answer
    x = 31.81

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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.