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Finding the Fourth Proportional to 352.94, 487.11 and 221.96

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Solution

The fourth proportional to 352.94, 487.11 and 221.96 is: 306.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.94 : 487.11 = 221.96 : x
  2. Step 2: Convert to fraction form
    352.94/487.11 = 221.96/x
  3. Step 3: Cross multiply
    352.94x = 487.11 × 221.96
  4. Step 4: Simplify right side
    352.94x = 108,118.94
  5. Step 5: Solve for x
    x = 108,118.94/352.94
  6. Step 6: Final answer
    x = 306.34

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.