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Finding the Fourth Proportional to 321.82, 443.04 and 279.80

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Solution

The fourth proportional to 321.82, 443.04 and 279.80 is: 385.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.82 : 443.04 = 279.80 : x
  2. Step 2: Convert to fraction form
    321.82/443.04 = 279.80/x
  3. Step 3: Cross multiply
    321.82x = 443.04 × 279.80
  4. Step 4: Simplify right side
    321.82x = 123,962.59
  5. Step 5: Solve for x
    x = 123,962.59/321.82
  6. Step 6: Final answer
    x = 385.19

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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.