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Finding the Fourth Proportional to 221.17, 330.08 and 215.41

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Solution

The fourth proportional to 221.17, 330.08 and 215.41 is: 321.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.17 : 330.08 = 215.41 : x
  2. Step 2: Convert to fraction form
    221.17/330.08 = 215.41/x
  3. Step 3: Cross multiply
    221.17x = 330.08 × 215.41
  4. Step 4: Simplify right side
    221.17x = 71,103.07
  5. Step 5: Solve for x
    x = 71,103.07/221.17
  6. Step 6: Final answer
    x = 321.49

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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.