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Finding the Fourth Proportional to 54.36, 81.19 and 40.86

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Solution

The fourth proportional to 54.36, 81.19 and 40.86 is: 61.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.36 : 81.19 = 40.86 : x
  2. Step 2: Convert to fraction form
    54.36/81.19 = 40.86/x
  3. Step 3: Cross multiply
    54.36x = 81.19 × 40.86
  4. Step 4: Simplify right side
    54.36x = 3,317.42
  5. Step 5: Solve for x
    x = 3,317.42/54.36
  6. Step 6: Final answer
    x = 61.03

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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.