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Finding the Fourth Proportional to 403.80, 605.93 and 221.19

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Solution

The fourth proportional to 403.80, 605.93 and 221.19 is: 331.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.80 : 605.93 = 221.19 : x
  2. Step 2: Convert to fraction form
    403.80/605.93 = 221.19/x
  3. Step 3: Cross multiply
    403.80x = 605.93 × 221.19
  4. Step 4: Simplify right side
    403.80x = 134,025.66
  5. Step 5: Solve for x
    x = 134,025.66/403.80
  6. Step 6: Final answer
    x = 331.91

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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.