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Finding the Fourth Proportional to 197.80, 296.63 and 67.78

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Solution

The fourth proportional to 197.80, 296.63 and 67.78 is: 101.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.80 : 296.63 = 67.78 : x
  2. Step 2: Convert to fraction form
    197.80/296.63 = 67.78/x
  3. Step 3: Cross multiply
    197.80x = 296.63 × 67.78
  4. Step 4: Simplify right side
    197.80x = 20,104.10
  5. Step 5: Solve for x
    x = 20,104.10/197.80
  6. Step 6: Final answer
    x = 101.64

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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.