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Finding the Fourth Proportional to 221.32, 330.01 and 213.42

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Solution

The fourth proportional to 221.32, 330.01 and 213.42 is: 318.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.32 : 330.01 = 213.42 : x
  2. Step 2: Convert to fraction form
    221.32/330.01 = 213.42/x
  3. Step 3: Cross multiply
    221.32x = 330.01 × 213.42
  4. Step 4: Simplify right side
    221.32x = 70,430.73
  5. Step 5: Solve for x
    x = 70,430.73/221.32
  6. Step 6: Final answer
    x = 318.23

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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.