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Finding the Fourth Proportional to 403.66, 605.08 and 221.02

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Solution

The fourth proportional to 403.66, 605.08 and 221.02 is: 331.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.66 : 605.08 = 221.02 : x
  2. Step 2: Convert to fraction form
    403.66/605.08 = 221.02/x
  3. Step 3: Cross multiply
    403.66x = 605.08 × 221.02
  4. Step 4: Simplify right side
    403.66x = 133,734.78
  5. Step 5: Solve for x
    x = 133,734.78/403.66
  6. Step 6: Final answer
    x = 331.31

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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.