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Finding the Fourth Proportional to 320.40, 480.24 and 217.71

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Solution

The fourth proportional to 320.40, 480.24 and 217.71 is: 326.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.40 : 480.24 = 217.71 : x
  2. Step 2: Convert to fraction form
    320.40/480.24 = 217.71/x
  3. Step 3: Cross multiply
    320.40x = 480.24 × 217.71
  4. Step 4: Simplify right side
    320.40x = 104,553.05
  5. Step 5: Solve for x
    x = 104,553.05/320.40
  6. Step 6: Final answer
    x = 326.32

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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.