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Finding the Fourth Proportional to 221.28, 329.14 and 220.54

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Solution

The fourth proportional to 221.28, 329.14 and 220.54 is: 328.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.28 : 329.14 = 220.54 : x
  2. Step 2: Convert to fraction form
    221.28/329.14 = 220.54/x
  3. Step 3: Cross multiply
    221.28x = 329.14 × 220.54
  4. Step 4: Simplify right side
    221.28x = 72,587.43
  5. Step 5: Solve for x
    x = 72,587.43/221.28
  6. Step 6: Final answer
    x = 328.03

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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.