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Finding the Fourth Proportional to 154.85, 231.86 and 109.49

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Solution

The fourth proportional to 154.85, 231.86 and 109.49 is: 163.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.85 : 231.86 = 109.49 : x
  2. Step 2: Convert to fraction form
    154.85/231.86 = 109.49/x
  3. Step 3: Cross multiply
    154.85x = 231.86 × 109.49
  4. Step 4: Simplify right side
    154.85x = 25,385.47
  5. Step 5: Solve for x
    x = 25,385.47/154.85
  6. Step 6: Final answer
    x = 163.94

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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.