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Finding the Fourth Proportional to 196.18, 270.80 and 122.56

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Solution

The fourth proportional to 196.18, 270.80 and 122.56 is: 169.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.18 : 270.80 = 122.56 : x
  2. Step 2: Convert to fraction form
    196.18/270.80 = 122.56/x
  3. Step 3: Cross multiply
    196.18x = 270.80 × 122.56
  4. Step 4: Simplify right side
    196.18x = 33,189.25
  5. Step 5: Solve for x
    x = 33,189.25/196.18
  6. Step 6: Final answer
    x = 169.18

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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.