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Finding the Fourth Proportional to 322.25, 443.61 and 289.44

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Solution

The fourth proportional to 322.25, 443.61 and 289.44 is: 398.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.25 : 443.61 = 289.44 : x
  2. Step 2: Convert to fraction form
    322.25/443.61 = 289.44/x
  3. Step 3: Cross multiply
    322.25x = 443.61 × 289.44
  4. Step 4: Simplify right side
    322.25x = 128,398.48
  5. Step 5: Solve for x
    x = 128,398.48/322.25
  6. Step 6: Final answer
    x = 398.45

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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.