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Finding the Fourth Proportional to 403.68, 605.72 and 221.08

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Solution

The fourth proportional to 403.68, 605.72 and 221.08 is: 331.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.68 : 605.72 = 221.08 : x
  2. Step 2: Convert to fraction form
    403.68/605.72 = 221.08/x
  3. Step 3: Cross multiply
    403.68x = 605.72 × 221.08
  4. Step 4: Simplify right side
    403.68x = 133,912.58
  5. Step 5: Solve for x
    x = 133,912.58/403.68
  6. Step 6: Final answer
    x = 331.73

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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.