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Finding the Fourth Proportional to 168.14, 231.72 and 131.24

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Solution

The fourth proportional to 168.14, 231.72 and 131.24 is: 180.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.14 : 231.72 = 131.24 : x
  2. Step 2: Convert to fraction form
    168.14/231.72 = 131.24/x
  3. Step 3: Cross multiply
    168.14x = 231.72 × 131.24
  4. Step 4: Simplify right side
    168.14x = 30,410.93
  5. Step 5: Solve for x
    x = 30,410.93/168.14
  6. Step 6: Final answer
    x = 180.87

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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.