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Finding the Fourth Proportional to 168.20, 231.98 and 126.89

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Solution

The fourth proportional to 168.20, 231.98 and 126.89 is: 175.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.20 : 231.98 = 126.89 : x
  2. Step 2: Convert to fraction form
    168.20/231.98 = 126.89/x
  3. Step 3: Cross multiply
    168.20x = 231.98 × 126.89
  4. Step 4: Simplify right side
    168.20x = 29,435.94
  5. Step 5: Solve for x
    x = 29,435.94/168.20
  6. Step 6: Final answer
    x = 175.01

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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.