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Finding the Fourth Proportional to 196.22, 270.78 and 122.55

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Solution

The fourth proportional to 196.22, 270.78 and 122.55 is: 169.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.22 : 270.78 = 122.55 : x
  2. Step 2: Convert to fraction form
    196.22/270.78 = 122.55/x
  3. Step 3: Cross multiply
    196.22x = 270.78 × 122.55
  4. Step 4: Simplify right side
    196.22x = 33,184.09
  5. Step 5: Solve for x
    x = 33,184.09/196.22
  6. Step 6: Final answer
    x = 169.12

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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.