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Finding the Fourth Proportional to 324.73, 487.10 and 81.25

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Solution

The fourth proportional to 324.73, 487.10 and 81.25 is: 121.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.73 : 487.10 = 81.25 : x
  2. Step 2: Convert to fraction form
    324.73/487.10 = 81.25/x
  3. Step 3: Cross multiply
    324.73x = 487.10 × 81.25
  4. Step 4: Simplify right side
    324.73x = 39,578.14
  5. Step 5: Solve for x
    x = 39,578.14/324.73
  6. Step 6: Final answer
    x = 121.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.