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Finding the Fourth Proportional to 403.54, 604.95 and 220.78

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Solution

The fourth proportional to 403.54, 604.95 and 220.78 is: 330.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.54 : 604.95 = 220.78 : x
  2. Step 2: Convert to fraction form
    403.54/604.95 = 220.78/x
  3. Step 3: Cross multiply
    403.54x = 604.95 × 220.78
  4. Step 4: Simplify right side
    403.54x = 133,560.86
  5. Step 5: Solve for x
    x = 133,560.86/403.54
  6. Step 6: Final answer
    x = 330.97

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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.