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Finding the Fourth Proportional to 198.76, 274.28 and 121.12

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Solution

The fourth proportional to 198.76, 274.28 and 121.12 is: 167.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.76 : 274.28 = 121.12 : x
  2. Step 2: Convert to fraction form
    198.76/274.28 = 121.12/x
  3. Step 3: Cross multiply
    198.76x = 274.28 × 121.12
  4. Step 4: Simplify right side
    198.76x = 33,220.79
  5. Step 5: Solve for x
    x = 33,220.79/198.76
  6. Step 6: Final answer
    x = 167.14

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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.