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Finding the Fourth Proportional to 239.60, 330.39 and 220.77

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Solution

The fourth proportional to 239.60, 330.39 and 220.77 is: 304.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.60 : 330.39 = 220.77 : x
  2. Step 2: Convert to fraction form
    239.60/330.39 = 220.77/x
  3. Step 3: Cross multiply
    239.60x = 330.39 × 220.77
  4. Step 4: Simplify right side
    239.60x = 72,940.20
  5. Step 5: Solve for x
    x = 72,940.20/239.60
  6. Step 6: Final answer
    x = 304.42

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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.