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Finding the Fourth Proportional to 196.17, 270.64 and 122.56

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Solution

The fourth proportional to 196.17, 270.64 and 122.56 is: 169.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.17 : 270.64 = 122.56 : x
  2. Step 2: Convert to fraction form
    196.17/270.64 = 122.56/x
  3. Step 3: Cross multiply
    196.17x = 270.64 × 122.56
  4. Step 4: Simplify right side
    196.17x = 33,170.64
  5. Step 5: Solve for x
    x = 33,170.64/196.17
  6. Step 6: Final answer
    x = 169.09

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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.