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Finding the Fourth Proportional to 196.25, 270.72 and 122.45

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Solution

The fourth proportional to 196.25, 270.72 and 122.45 is: 168.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.25 : 270.72 = 122.45 : x
  2. Step 2: Convert to fraction form
    196.25/270.72 = 122.45/x
  3. Step 3: Cross multiply
    196.25x = 270.72 × 122.45
  4. Step 4: Simplify right side
    196.25x = 33,148.31
  5. Step 5: Solve for x
    x = 33,148.31/196.25
  6. Step 6: Final answer
    x = 168.91

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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.