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Finding the Fourth Proportional to 54.23, 81.29 and 28.55

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Solution

The fourth proportional to 54.23, 81.29 and 28.55 is: 42.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.23 : 81.29 = 28.55 : x
  2. Step 2: Convert to fraction form
    54.23/81.29 = 28.55/x
  3. Step 3: Cross multiply
    54.23x = 81.29 × 28.55
  4. Step 4: Simplify right side
    54.23x = 2,321.10
  5. Step 5: Solve for x
    x = 2,321.10/54.23
  6. Step 6: Final answer
    x = 42.81

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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.