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Finding the Fourth Proportional to 221.04, 330.12 and 215.56

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Solution

The fourth proportional to 221.04, 330.12 and 215.56 is: 321.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.04 : 330.12 = 215.56 : x
  2. Step 2: Convert to fraction form
    221.04/330.12 = 215.56/x
  3. Step 3: Cross multiply
    221.04x = 330.12 × 215.56
  4. Step 4: Simplify right side
    221.04x = 71,160.67
  5. Step 5: Solve for x
    x = 71,160.67/221.04
  6. Step 6: Final answer
    x = 321.94

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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.