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Finding the Fourth Proportional to 168.12, 231.86 and 109.92

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Solution

The fourth proportional to 168.12, 231.86 and 109.92 is: 151.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.12 : 231.86 = 109.92 : x
  2. Step 2: Convert to fraction form
    168.12/231.86 = 109.92/x
  3. Step 3: Cross multiply
    168.12x = 231.86 × 109.92
  4. Step 4: Simplify right side
    168.12x = 25,486.05
  5. Step 5: Solve for x
    x = 25,486.05/168.12
  6. Step 6: Final answer
    x = 151.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.