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Finding the Fourth Proportional to 239.75, 329.90 and 220.08

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Solution

The fourth proportional to 239.75, 329.90 and 220.08 is: 302.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.75 : 329.90 = 220.08 : x
  2. Step 2: Convert to fraction form
    239.75/329.90 = 220.08/x
  3. Step 3: Cross multiply
    239.75x = 329.90 × 220.08
  4. Step 4: Simplify right side
    239.75x = 72,604.39
  5. Step 5: Solve for x
    x = 72,604.39/239.75
  6. Step 6: Final answer
    x = 302.83

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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.