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Finding the Fourth Proportional to 198.69, 274.08 and 133.21

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Solution

The fourth proportional to 198.69, 274.08 and 133.21 is: 183.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.69 : 274.08 = 133.21 : x
  2. Step 2: Convert to fraction form
    198.69/274.08 = 133.21/x
  3. Step 3: Cross multiply
    198.69x = 274.08 × 133.21
  4. Step 4: Simplify right side
    198.69x = 36,510.20
  5. Step 5: Solve for x
    x = 36,510.20/198.69
  6. Step 6: Final answer
    x = 183.76

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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.