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Finding the Fourth Proportional to 196.30, 270.79 and 122.64

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Solution

The fourth proportional to 196.30, 270.79 and 122.64 is: 169.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.30 : 270.79 = 122.64 : x
  2. Step 2: Convert to fraction form
    196.30/270.79 = 122.64/x
  3. Step 3: Cross multiply
    196.30x = 270.79 × 122.64
  4. Step 4: Simplify right side
    196.30x = 33,209.69
  5. Step 5: Solve for x
    x = 33,209.69/196.30
  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.