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Finding the Fourth Proportional to 221.28, 330.38 and 199.41

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Solution

The fourth proportional to 221.28, 330.38 and 199.41 is: 297.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.28 : 330.38 = 199.41 : x
  2. Step 2: Convert to fraction form
    221.28/330.38 = 199.41/x
  3. Step 3: Cross multiply
    221.28x = 330.38 × 199.41
  4. Step 4: Simplify right side
    221.28x = 65,881.08
  5. Step 5: Solve for x
    x = 65,881.08/221.28
  6. Step 6: Final answer
    x = 297.73

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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.