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Finding the Fourth Proportional to 239.34, 329.40 and 218.64

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Solution

The fourth proportional to 239.34, 329.40 and 218.64 is: 300.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.34 : 329.40 = 218.64 : x
  2. Step 2: Convert to fraction form
    239.34/329.40 = 218.64/x
  3. Step 3: Cross multiply
    239.34x = 329.40 × 218.64
  4. Step 4: Simplify right side
    239.34x = 72,020.02
  5. Step 5: Solve for x
    x = 72,020.02/239.34
  6. Step 6: Final answer
    x = 300.91

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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.