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Finding the Fourth Proportional to 324.20, 447.20 and 211.99

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Solution

The fourth proportional to 324.20, 447.20 and 211.99 is: 292.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.20 : 447.20 = 211.99 : x
  2. Step 2: Convert to fraction form
    324.20/447.20 = 211.99/x
  3. Step 3: Cross multiply
    324.20x = 447.20 × 211.99
  4. Step 4: Simplify right side
    324.20x = 94,801.38
  5. Step 5: Solve for x
    x = 94,801.38/324.20
  6. Step 6: Final answer
    x = 292.41

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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.