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Finding the Fourth Proportional to 239.72, 329.76 and 238.16

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Solution

The fourth proportional to 239.72, 329.76 and 238.16 is: 327.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.72 : 329.76 = 238.16 : x
  2. Step 2: Convert to fraction form
    239.72/329.76 = 238.16/x
  3. Step 3: Cross multiply
    239.72x = 329.76 × 238.16
  4. Step 4: Simplify right side
    239.72x = 78,535.64
  5. Step 5: Solve for x
    x = 78,535.64/239.72
  6. Step 6: Final answer
    x = 327.61

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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.