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Finding the Fourth Proportional to 168.05, 251.90 and 91

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Solution

The fourth proportional to 168.05, 251.90 and 91 is: 136.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.05 : 251.90 = 91 : x
  2. Step 2: Convert to fraction form
    168.05/251.90 = 91/x
  3. Step 3: Cross multiply
    168.05x = 251.90 × 91
  4. Step 4: Simplify right side
    168.05x = 22,922.90
  5. Step 5: Solve for x
    x = 22,922.90/168.05
  6. Step 6: Final answer
    x = 136.41

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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.