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Finding the Fourth Proportional to 221.85, 331.14 and 208.17

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Solution

The fourth proportional to 221.85, 331.14 and 208.17 is: 310.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.85 : 331.14 = 208.17 : x
  2. Step 2: Convert to fraction form
    221.85/331.14 = 208.17/x
  3. Step 3: Cross multiply
    221.85x = 331.14 × 208.17
  4. Step 4: Simplify right side
    221.85x = 68,933.41
  5. Step 5: Solve for x
    x = 68,933.41/221.85
  6. Step 6: Final answer
    x = 310.72

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.