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Finding the Fourth Proportional to 22.21, 33.16 and 20.94

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Solution

The fourth proportional to 22.21, 33.16 and 20.94 is: 31.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.21 : 33.16 = 20.94 : x
  2. Step 2: Convert to fraction form
    22.21/33.16 = 20.94/x
  3. Step 3: Cross multiply
    22.21x = 33.16 × 20.94
  4. Step 4: Simplify right side
    22.21x = 694.32
  5. Step 5: Solve for x
    x = 694.32/22.21
  6. Step 6: Final answer
    x = 31.27

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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.