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Finding the Fourth Proportional to 54.38, 81.57 and 25.88

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Solution

The fourth proportional to 54.38, 81.57 and 25.88 is: 38.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.38 : 81.57 = 25.88 : x
  2. Step 2: Convert to fraction form
    54.38/81.57 = 25.88/x
  3. Step 3: Cross multiply
    54.38x = 81.57 × 25.88
  4. Step 4: Simplify right side
    54.38x = 2,110.69
  5. Step 5: Solve for x
    x = 2,110.69/54.38
  6. Step 6: Final answer
    x = 38.82

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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.