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Finding the Fourth Proportional to 220.42, 331.09 and 208.17

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Solution

The fourth proportional to 220.42, 331.09 and 208.17 is: 312.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.42 : 331.09 = 208.17 : x
  2. Step 2: Convert to fraction form
    220.42/331.09 = 208.17/x
  3. Step 3: Cross multiply
    220.42x = 331.09 × 208.17
  4. Step 4: Simplify right side
    220.42x = 68,922.48
  5. Step 5: Solve for x
    x = 68,922.48/220.42
  6. Step 6: Final answer
    x = 312.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.