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Finding the Fourth Proportional to 239.16, 356.82 and 220.98

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Solution

The fourth proportional to 239.16, 356.82 and 220.98 is: 329.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.16 : 356.82 = 220.98 : x
  2. Step 2: Convert to fraction form
    239.16/356.82 = 220.98/x
  3. Step 3: Cross multiply
    239.16x = 356.82 × 220.98
  4. Step 4: Simplify right side
    239.16x = 78,850.08
  5. Step 5: Solve for x
    x = 78,850.08/239.16
  6. Step 6: Final answer
    x = 329.70

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.