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Finding the Fourth Proportional to 54.87, 81.79 and 54.03

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Solution

The fourth proportional to 54.87, 81.79 and 54.03 is: 80.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.87 : 81.79 = 54.03 : x
  2. Step 2: Convert to fraction form
    54.87/81.79 = 54.03/x
  3. Step 3: Cross multiply
    54.87x = 81.79 × 54.03
  4. Step 4: Simplify right side
    54.87x = 4,419.49
  5. Step 5: Solve for x
    x = 4,419.49/54.87
  6. Step 6: Final answer
    x = 80.54

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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.