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Finding the Fourth Proportional to 220.72, 304.68 and 196.96

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Solution

The fourth proportional to 220.72, 304.68 and 196.96 is: 271.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.72 : 304.68 = 196.96 : x
  2. Step 2: Convert to fraction form
    220.72/304.68 = 196.96/x
  3. Step 3: Cross multiply
    220.72x = 304.68 × 196.96
  4. Step 4: Simplify right side
    220.72x = 60,009.77
  5. Step 5: Solve for x
    x = 60,009.77/220.72
  6. Step 6: Final answer
    x = 271.88

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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.