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Finding the Fourth Proportional to 221.12, 329.66 and 215.51

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Solution

The fourth proportional to 221.12, 329.66 and 215.51 is: 321.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.12 : 329.66 = 215.51 : x
  2. Step 2: Convert to fraction form
    221.12/329.66 = 215.51/x
  3. Step 3: Cross multiply
    221.12x = 329.66 × 215.51
  4. Step 4: Simplify right side
    221.12x = 71,042.30
  5. Step 5: Solve for x
    x = 71,042.30/221.12
  6. Step 6: Final answer
    x = 321.29

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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.