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Finding the Fourth Proportional to 54.13, 81.05 and 45.55

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Solution

The fourth proportional to 54.13, 81.05 and 45.55 is: 68.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.13 : 81.05 = 45.55 : x
  2. Step 2: Convert to fraction form
    54.13/81.05 = 45.55/x
  3. Step 3: Cross multiply
    54.13x = 81.05 × 45.55
  4. Step 4: Simplify right side
    54.13x = 3,691.42
  5. Step 5: Solve for x
    x = 3,691.42/54.13
  6. Step 6: Final answer
    x = 68.20

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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.