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Finding the Fourth Proportional to 168.30, 231.93 and 138.69

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Solution

The fourth proportional to 168.30, 231.93 and 138.69 is: 191.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.30 : 231.93 = 138.69 : x
  2. Step 2: Convert to fraction form
    168.30/231.93 = 138.69/x
  3. Step 3: Cross multiply
    168.30x = 231.93 × 138.69
  4. Step 4: Simplify right side
    168.30x = 32,166.37
  5. Step 5: Solve for x
    x = 32,166.37/168.30
  6. Step 6: Final answer
    x = 191.13

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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.