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Finding the Fourth Proportional to 322.69, 445.51 and 239.70

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Solution

The fourth proportional to 322.69, 445.51 and 239.70 is: 330.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.69 : 445.51 = 239.70 : x
  2. Step 2: Convert to fraction form
    322.69/445.51 = 239.70/x
  3. Step 3: Cross multiply
    322.69x = 445.51 × 239.70
  4. Step 4: Simplify right side
    322.69x = 106,788.75
  5. Step 5: Solve for x
    x = 106,788.75/322.69
  6. Step 6: Final answer
    x = 330.93

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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.