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Finding the Fourth Proportional to 196.46, 294.46 and 80.78

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Solution

The fourth proportional to 196.46, 294.46 and 80.78 is: 121.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.46 : 294.46 = 80.78 : x
  2. Step 2: Convert to fraction form
    196.46/294.46 = 80.78/x
  3. Step 3: Cross multiply
    196.46x = 294.46 × 80.78
  4. Step 4: Simplify right side
    196.46x = 23,786.48
  5. Step 5: Solve for x
    x = 23,786.48/196.46
  6. Step 6: Final answer
    x = 121.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.