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Finding the Fourth Proportional to 196.31, 270.86 and 122.60

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Solution

The fourth proportional to 196.31, 270.86 and 122.60 is: 169.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.31 : 270.86 = 122.60 : x
  2. Step 2: Convert to fraction form
    196.31/270.86 = 122.60/x
  3. Step 3: Cross multiply
    196.31x = 270.86 × 122.60
  4. Step 4: Simplify right side
    196.31x = 33,205.47
  5. Step 5: Solve for x
    x = 33,205.47/196.31
  6. Step 6: Final answer
    x = 169.15

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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.