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Finding the Fourth Proportional to 196.57, 271.33 and 121.92

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Solution

The fourth proportional to 196.57, 271.33 and 121.92 is: 168.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.57 : 271.33 = 121.92 : x
  2. Step 2: Convert to fraction form
    196.57/271.33 = 121.92/x
  3. Step 3: Cross multiply
    196.57x = 271.33 × 121.92
  4. Step 4: Simplify right side
    196.57x = 33,079.94
  5. Step 5: Solve for x
    x = 33,079.94/196.57
  6. Step 6: Final answer
    x = 168.29

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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.