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Finding the Fourth Proportional to 54.20, 80.92 and 45.09

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Solution

The fourth proportional to 54.20, 80.92 and 45.09 is: 67.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.20 : 80.92 = 45.09 : x
  2. Step 2: Convert to fraction form
    54.20/80.92 = 45.09/x
  3. Step 3: Cross multiply
    54.20x = 80.92 × 45.09
  4. Step 4: Simplify right side
    54.20x = 3,648.49
  5. Step 5: Solve for x
    x = 3,648.49/54.20
  6. Step 6: Final answer
    x = 67.31

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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.