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Finding the Fourth Proportional to 403.27, 603.93 and 220.21

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Solution

The fourth proportional to 403.27, 603.93 and 220.21 is: 329.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.27 : 603.93 = 220.21 : x
  2. Step 2: Convert to fraction form
    403.27/603.93 = 220.21/x
  3. Step 3: Cross multiply
    403.27x = 603.93 × 220.21
  4. Step 4: Simplify right side
    403.27x = 132,991.43
  5. Step 5: Solve for x
    x = 132,991.43/403.27
  6. Step 6: Final answer
    x = 329.78

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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.