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Finding the Fourth Proportional to 168.35, 232.20 and 121.68

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Solution

The fourth proportional to 168.35, 232.20 and 121.68 is: 167.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.35 : 232.20 = 121.68 : x
  2. Step 2: Convert to fraction form
    168.35/232.20 = 121.68/x
  3. Step 3: Cross multiply
    168.35x = 232.20 × 121.68
  4. Step 4: Simplify right side
    168.35x = 28,254.10
  5. Step 5: Solve for x
    x = 28,254.10/168.35
  6. Step 6: Final answer
    x = 167.83

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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.