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Finding the Fourth Proportional to 239.54, 330.75 and 221.11

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Solution

The fourth proportional to 239.54, 330.75 and 221.11 is: 305.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.54 : 330.75 = 221.11 : x
  2. Step 2: Convert to fraction form
    239.54/330.75 = 221.11/x
  3. Step 3: Cross multiply
    239.54x = 330.75 × 221.11
  4. Step 4: Simplify right side
    239.54x = 73,131.31
  5. Step 5: Solve for x
    x = 73,131.31/239.54
  6. Step 6: Final answer
    x = 305.31

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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.