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Finding the Fourth Proportional to 221.19, 329.44 and 209.62

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Solution

The fourth proportional to 221.19, 329.44 and 209.62 is: 312.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.19 : 329.44 = 209.62 : x
  2. Step 2: Convert to fraction form
    221.19/329.44 = 209.62/x
  3. Step 3: Cross multiply
    221.19x = 329.44 × 209.62
  4. Step 4: Simplify right side
    221.19x = 69,057.21
  5. Step 5: Solve for x
    x = 69,057.21/221.19
  6. Step 6: Final answer
    x = 312.21

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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.