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Finding the Fourth Proportional to 322.38, 479.60 and 321.30

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Solution

The fourth proportional to 322.38, 479.60 and 321.30 is: 477.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.38 : 479.60 = 321.30 : x
  2. Step 2: Convert to fraction form
    322.38/479.60 = 321.30/x
  3. Step 3: Cross multiply
    322.38x = 479.60 × 321.30
  4. Step 4: Simplify right side
    322.38x = 154,093.87
  5. Step 5: Solve for x
    x = 154,093.87/322.38
  6. Step 6: Final answer
    x = 477.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.