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Finding the Fourth Proportional to 403.99, 605.58 and 221.33

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Solution

The fourth proportional to 403.99, 605.58 and 221.33 is: 331.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.99 : 605.58 = 221.33 : x
  2. Step 2: Convert to fraction form
    403.99/605.58 = 221.33/x
  3. Step 3: Cross multiply
    403.99x = 605.58 × 221.33
  4. Step 4: Simplify right side
    403.99x = 134,033.71
  5. Step 5: Solve for x
    x = 134,033.71/403.99
  6. Step 6: Final answer
    x = 331.78

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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.