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Finding the Fourth Proportional to 133.21, 198.86 and 119.56

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Solution

The fourth proportional to 133.21, 198.86 and 119.56 is: 178.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.21 : 198.86 = 119.56 : x
  2. Step 2: Convert to fraction form
    133.21/198.86 = 119.56/x
  3. Step 3: Cross multiply
    133.21x = 198.86 × 119.56
  4. Step 4: Simplify right side
    133.21x = 23,775.70
  5. Step 5: Solve for x
    x = 23,775.70/133.21
  6. Step 6: Final answer
    x = 178.48

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.