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Finding the Fourth Proportional to 168.12, 231.30 and 136.68

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Solution

The fourth proportional to 168.12, 231.30 and 136.68 is: 188.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.12 : 231.30 = 136.68 : x
  2. Step 2: Convert to fraction form
    168.12/231.30 = 136.68/x
  3. Step 3: Cross multiply
    168.12x = 231.30 × 136.68
  4. Step 4: Simplify right side
    168.12x = 31,614.08
  5. Step 5: Solve for x
    x = 31,614.08/168.12
  6. Step 6: Final answer
    x = 188.04

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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.