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Finding the Fourth Proportional to 239.83, 330.69 and 220.39

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Solution

The fourth proportional to 239.83, 330.69 and 220.39 is: 303.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.83 : 330.69 = 220.39 : x
  2. Step 2: Convert to fraction form
    239.83/330.69 = 220.39/x
  3. Step 3: Cross multiply
    239.83x = 330.69 × 220.39
  4. Step 4: Simplify right side
    239.83x = 72,880.77
  5. Step 5: Solve for x
    x = 72,880.77/239.83
  6. Step 6: Final answer
    x = 303.89

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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.