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Finding the Fourth Proportional to 54.62, 81.91 and 20.38

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Solution

The fourth proportional to 54.62, 81.91 and 20.38 is: 30.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.62 : 81.91 = 20.38 : x
  2. Step 2: Convert to fraction form
    54.62/81.91 = 20.38/x
  3. Step 3: Cross multiply
    54.62x = 81.91 × 20.38
  4. Step 4: Simplify right side
    54.62x = 1,669.22
  5. Step 5: Solve for x
    x = 1,669.22/54.62
  6. Step 6: Final answer
    x = 30.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.