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Finding the Fourth Proportional to 321.22, 480.87 and 206.98

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Solution

The fourth proportional to 321.22, 480.87 and 206.98 is: 309.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.22 : 480.87 = 206.98 : x
  2. Step 2: Convert to fraction form
    321.22/480.87 = 206.98/x
  3. Step 3: Cross multiply
    321.22x = 480.87 × 206.98
  4. Step 4: Simplify right side
    321.22x = 99,530.47
  5. Step 5: Solve for x
    x = 99,530.47/321.22
  6. Step 6: Final answer
    x = 309.85

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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.