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Finding the Fourth Proportional to 168.39, 231.90 and 137.21

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Solution

The fourth proportional to 168.39, 231.90 and 137.21 is: 188.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.39 : 231.90 = 137.21 : x
  2. Step 2: Convert to fraction form
    168.39/231.90 = 137.21/x
  3. Step 3: Cross multiply
    168.39x = 231.90 × 137.21
  4. Step 4: Simplify right side
    168.39x = 31,819.00
  5. Step 5: Solve for x
    x = 31,819.00/168.39
  6. Step 6: Final answer
    x = 188.96

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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.