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Finding the Fourth Proportional to 239.36, 329.36 and 218.64

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Solution

The fourth proportional to 239.36, 329.36 and 218.64 is: 300.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.36 : 329.36 = 218.64 : x
  2. Step 2: Convert to fraction form
    239.36/329.36 = 218.64/x
  3. Step 3: Cross multiply
    239.36x = 329.36 × 218.64
  4. Step 4: Simplify right side
    239.36x = 72,011.27
  5. Step 5: Solve for x
    x = 72,011.27/239.36
  6. Step 6: Final answer
    x = 300.85

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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.