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Finding the Fourth Proportional to 221.22, 330.84 and 216.36

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Solution

The fourth proportional to 221.22, 330.84 and 216.36 is: 323.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.22 : 330.84 = 216.36 : x
  2. Step 2: Convert to fraction form
    221.22/330.84 = 216.36/x
  3. Step 3: Cross multiply
    221.22x = 330.84 × 216.36
  4. Step 4: Simplify right side
    221.22x = 71,580.54
  5. Step 5: Solve for x
    x = 71,580.54/221.22
  6. Step 6: Final answer
    x = 323.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.