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Finding the Fourth Proportional to 239.97, 331.70 and 220.83

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Solution

The fourth proportional to 239.97, 331.70 and 220.83 is: 305.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.97 : 331.70 = 220.83 : x
  2. Step 2: Convert to fraction form
    239.97/331.70 = 220.83/x
  3. Step 3: Cross multiply
    239.97x = 331.70 × 220.83
  4. Step 4: Simplify right side
    239.97x = 73,248.21
  5. Step 5: Solve for x
    x = 73,248.21/239.97
  6. Step 6: Final answer
    x = 305.25

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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.