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Finding the Fourth Proportional to 197.76, 296.16 and 120.78

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Solution

The fourth proportional to 197.76, 296.16 and 120.78 is: 180.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.76 : 296.16 = 120.78 : x
  2. Step 2: Convert to fraction form
    197.76/296.16 = 120.78/x
  3. Step 3: Cross multiply
    197.76x = 296.16 × 120.78
  4. Step 4: Simplify right side
    197.76x = 35,770.20
  5. Step 5: Solve for x
    x = 35,770.20/197.76
  6. Step 6: Final answer
    x = 180.88

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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.