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Finding the Fourth Proportional to 221.97, 334.90 and 220.15

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Solution

The fourth proportional to 221.97, 334.90 and 220.15 is: 332.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.97 : 334.90 = 220.15 : x
  2. Step 2: Convert to fraction form
    221.97/334.90 = 220.15/x
  3. Step 3: Cross multiply
    221.97x = 334.90 × 220.15
  4. Step 4: Simplify right side
    221.97x = 73,728.24
  5. Step 5: Solve for x
    x = 73,728.24/221.97
  6. Step 6: Final answer
    x = 332.15

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.