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Finding the Fourth Proportional to 196.45, 271.02 and 122.80

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Solution

The fourth proportional to 196.45, 271.02 and 122.80 is: 169.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.45 : 271.02 = 122.80 : x
  2. Step 2: Convert to fraction form
    196.45/271.02 = 122.80/x
  3. Step 3: Cross multiply
    196.45x = 271.02 × 122.80
  4. Step 4: Simplify right side
    196.45x = 33,281.26
  5. Step 5: Solve for x
    x = 33,281.26/196.45
  6. Step 6: Final answer
    x = 169.41

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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.