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Finding the Fourth Proportional to 321.11, 480.72 and 198.98

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Solution

The fourth proportional to 321.11, 480.72 and 198.98 is: 297.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.11 : 480.72 = 198.98 : x
  2. Step 2: Convert to fraction form
    321.11/480.72 = 198.98/x
  3. Step 3: Cross multiply
    321.11x = 480.72 × 198.98
  4. Step 4: Simplify right side
    321.11x = 95,653.67
  5. Step 5: Solve for x
    x = 95,653.67/321.11
  6. Step 6: Final answer
    x = 297.88

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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.