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Finding the Fourth Proportional to 221.99, 305.51 and 196.88

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Solution

The fourth proportional to 221.99, 305.51 and 196.88 is: 270.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.99 : 305.51 = 196.88 : x
  2. Step 2: Convert to fraction form
    221.99/305.51 = 196.88/x
  3. Step 3: Cross multiply
    221.99x = 305.51 × 196.88
  4. Step 4: Simplify right side
    221.99x = 60,146.30
  5. Step 5: Solve for x
    x = 60,146.30/221.99
  6. Step 6: Final answer
    x = 270.95

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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.