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Finding the Fourth Proportional to 221.97, 305.51 and 213.69

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Solution

The fourth proportional to 221.97, 305.51 and 213.69 is: 294.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.97 : 305.51 = 213.69 : x
  2. Step 2: Convert to fraction form
    221.97/305.51 = 213.69/x
  3. Step 3: Cross multiply
    221.97x = 305.51 × 213.69
  4. Step 4: Simplify right side
    221.97x = 65,283.36
  5. Step 5: Solve for x
    x = 65,283.36/221.97
  6. Step 6: Final answer
    x = 294.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.