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Finding the Fourth Proportional to 198.72, 298.20 and 76.97

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Solution

The fourth proportional to 198.72, 298.20 and 76.97 is: 115.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.72 : 298.20 = 76.97 : x
  2. Step 2: Convert to fraction form
    198.72/298.20 = 76.97/x
  3. Step 3: Cross multiply
    198.72x = 298.20 × 76.97
  4. Step 4: Simplify right side
    198.72x = 22,953.06
  5. Step 5: Solve for x
    x = 22,953.06/198.72
  6. Step 6: Final answer
    x = 115.50

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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.