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Finding the Fourth Proportional to 168.12, 231.65 and 131.21

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Solution

The fourth proportional to 168.12, 231.65 and 131.21 is: 180.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.12 : 231.65 = 131.21 : x
  2. Step 2: Convert to fraction form
    168.12/231.65 = 131.21/x
  3. Step 3: Cross multiply
    168.12x = 231.65 × 131.21
  4. Step 4: Simplify right side
    168.12x = 30,395.70
  5. Step 5: Solve for x
    x = 30,395.70/168.12
  6. Step 6: Final answer
    x = 180.80

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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.