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Finding the Fourth Proportional to 324.30, 447.31 and 193.20

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Solution

The fourth proportional to 324.30, 447.31 and 193.20 is: 266.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.30 : 447.31 = 193.20 : x
  2. Step 2: Convert to fraction form
    324.30/447.31 = 193.20/x
  3. Step 3: Cross multiply
    324.30x = 447.31 × 193.20
  4. Step 4: Simplify right side
    324.30x = 86,420.29
  5. Step 5: Solve for x
    x = 86,420.29/324.30
  6. Step 6: Final answer
    x = 266.48

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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.