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Finding the Fourth Proportional to 239.83, 329.86 and 221.60

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Solution

The fourth proportional to 239.83, 329.86 and 221.60 is: 304.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.83 : 329.86 = 221.60 : x
  2. Step 2: Convert to fraction form
    239.83/329.86 = 221.60/x
  3. Step 3: Cross multiply
    239.83x = 329.86 × 221.60
  4. Step 4: Simplify right side
    239.83x = 73,096.98
  5. Step 5: Solve for x
    x = 73,096.98/239.83
  6. Step 6: Final answer
    x = 304.79

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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.