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Finding the Fourth Proportional to 54.81, 81.65 and 54.11

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Solution

The fourth proportional to 54.81, 81.65 and 54.11 is: 80.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.81 : 81.65 = 54.11 : x
  2. Step 2: Convert to fraction form
    54.81/81.65 = 54.11/x
  3. Step 3: Cross multiply
    54.81x = 81.65 × 54.11
  4. Step 4: Simplify right side
    54.81x = 4,417.40
  5. Step 5: Solve for x
    x = 4,417.40/54.81
  6. Step 6: Final answer
    x = 80.59

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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.