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Finding the Fourth Proportional to 239.75, 331.25 and 221.52

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Solution

The fourth proportional to 239.75, 331.25 and 221.52 is: 306.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.75 : 331.25 = 221.52 : x
  2. Step 2: Convert to fraction form
    239.75/331.25 = 221.52/x
  3. Step 3: Cross multiply
    239.75x = 331.25 × 221.52
  4. Step 4: Simplify right side
    239.75x = 73,378.50
  5. Step 5: Solve for x
    x = 73,378.50/239.75
  6. Step 6: Final answer
    x = 306.06

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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.