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Finding the Fourth Proportional to 168.12, 251.55 and 138.96

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Solution

The fourth proportional to 168.12, 251.55 and 138.96 is: 207.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.12 : 251.55 = 138.96 : x
  2. Step 2: Convert to fraction form
    168.12/251.55 = 138.96/x
  3. Step 3: Cross multiply
    168.12x = 251.55 × 138.96
  4. Step 4: Simplify right side
    168.12x = 34,955.39
  5. Step 5: Solve for x
    x = 34,955.39/168.12
  6. Step 6: Final answer
    x = 207.92

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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.