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Finding the Fourth Proportional to 54.22, 81.02 and 43.42

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Solution

The fourth proportional to 54.22, 81.02 and 43.42 is: 64.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.22 : 81.02 = 43.42 : x
  2. Step 2: Convert to fraction form
    54.22/81.02 = 43.42/x
  3. Step 3: Cross multiply
    54.22x = 81.02 × 43.42
  4. Step 4: Simplify right side
    54.22x = 3,517.89
  5. Step 5: Solve for x
    x = 3,517.89/54.22
  6. Step 6: Final answer
    x = 64.88

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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.