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Finding the Fourth Proportional to 403.78, 605.32 and 220.96

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Solution

The fourth proportional to 403.78, 605.32 and 220.96 is: 331.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.78 : 605.32 = 220.96 : x
  2. Step 2: Convert to fraction form
    403.78/605.32 = 220.96/x
  3. Step 3: Cross multiply
    403.78x = 605.32 × 220.96
  4. Step 4: Simplify right side
    403.78x = 133,751.51
  5. Step 5: Solve for x
    x = 133,751.51/403.78
  6. Step 6: Final answer
    x = 331.25

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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.