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Finding the Fourth Proportional to 322.20, 444.69 and 239.40

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Solution

The fourth proportional to 322.20, 444.69 and 239.40 is: 330.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.20 : 444.69 = 239.40 : x
  2. Step 2: Convert to fraction form
    322.20/444.69 = 239.40/x
  3. Step 3: Cross multiply
    322.20x = 444.69 × 239.40
  4. Step 4: Simplify right side
    322.20x = 106,458.79
  5. Step 5: Solve for x
    x = 106,458.79/322.20
  6. Step 6: Final answer
    x = 330.41

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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.