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Finding the Fourth Proportional to 54.74, 81.46 and 54.38

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Solution

The fourth proportional to 54.74, 81.46 and 54.38 is: 80.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.74 : 81.46 = 54.38 : x
  2. Step 2: Convert to fraction form
    54.74/81.46 = 54.38/x
  3. Step 3: Cross multiply
    54.74x = 81.46 × 54.38
  4. Step 4: Simplify right side
    54.74x = 4,429.79
  5. Step 5: Solve for x
    x = 4,429.79/54.74
  6. Step 6: Final answer
    x = 80.92

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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.