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Finding the Fourth Proportional to 321.41, 443.99 and 255.83

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Solution

The fourth proportional to 321.41, 443.99 and 255.83 is: 353.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.41 : 443.99 = 255.83 : x
  2. Step 2: Convert to fraction form
    321.41/443.99 = 255.83/x
  3. Step 3: Cross multiply
    321.41x = 443.99 × 255.83
  4. Step 4: Simplify right side
    321.41x = 113,584.38
  5. Step 5: Solve for x
    x = 113,584.38/321.41
  6. Step 6: Final answer
    x = 353.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.