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Finding the Fourth Proportional to 54.48, 81.05 and 54.30

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Solution

The fourth proportional to 54.48, 81.05 and 54.30 is: 80.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.48 : 81.05 = 54.30 : x
  2. Step 2: Convert to fraction form
    54.48/81.05 = 54.30/x
  3. Step 3: Cross multiply
    54.48x = 81.05 × 54.30
  4. Step 4: Simplify right side
    54.48x = 4,401.02
  5. Step 5: Solve for x
    x = 4,401.02/54.48
  6. Step 6: Final answer
    x = 80.78

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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.