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Finding the Fourth Proportional to 198.68, 298.18 and 76.98

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Solution

The fourth proportional to 198.68, 298.18 and 76.98 is: 115.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.68 : 298.18 = 76.98 : x
  2. Step 2: Convert to fraction form
    198.68/298.18 = 76.98/x
  3. Step 3: Cross multiply
    198.68x = 298.18 × 76.98
  4. Step 4: Simplify right side
    198.68x = 22,953.70
  5. Step 5: Solve for x
    x = 22,953.70/198.68
  6. Step 6: Final answer
    x = 115.53

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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.