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Finding the Fourth Proportional to 221.12, 333.20 and 219.28

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Solution

The fourth proportional to 221.12, 333.20 and 219.28 is: 330.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.12 : 333.20 = 219.28 : x
  2. Step 2: Convert to fraction form
    221.12/333.20 = 219.28/x
  3. Step 3: Cross multiply
    221.12x = 333.20 × 219.28
  4. Step 4: Simplify right side
    221.12x = 73,064.10
  5. Step 5: Solve for x
    x = 73,064.10/221.12
  6. Step 6: Final answer
    x = 330.43

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.