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Finding the Fourth Proportional to 239.15, 329.82 and 212.60

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Solution

The fourth proportional to 239.15, 329.82 and 212.60 is: 293.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.15 : 329.82 = 212.60 : x
  2. Step 2: Convert to fraction form
    239.15/329.82 = 212.60/x
  3. Step 3: Cross multiply
    239.15x = 329.82 × 212.60
  4. Step 4: Simplify right side
    239.15x = 70,120.03
  5. Step 5: Solve for x
    x = 70,120.03/239.15
  6. Step 6: Final answer
    x = 293.20

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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.