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Finding the Fourth Proportional to 154.44, 231.59 and 81.15

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Solution

The fourth proportional to 154.44, 231.59 and 81.15 is: 121.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.44 : 231.59 = 81.15 : x
  2. Step 2: Convert to fraction form
    154.44/231.59 = 81.15/x
  3. Step 3: Cross multiply
    154.44x = 231.59 × 81.15
  4. Step 4: Simplify right side
    154.44x = 18,791.96
  5. Step 5: Solve for x
    x = 18,791.96/154.44
  6. Step 6: Final answer
    x = 121.68

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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.