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Finding the Fourth Proportional to 54.49, 81.83 and 42.55

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Solution

The fourth proportional to 54.49, 81.83 and 42.55 is: 63.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.49 : 81.83 = 42.55 : x
  2. Step 2: Convert to fraction form
    54.49/81.83 = 42.55/x
  3. Step 3: Cross multiply
    54.49x = 81.83 × 42.55
  4. Step 4: Simplify right side
    54.49x = 3,481.65
  5. Step 5: Solve for x
    x = 3,481.65/54.49
  6. Step 6: Final answer
    x = 63.90

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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.