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Finding the Fourth Proportional to 324.75, 486.48 and 221.78

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Solution

The fourth proportional to 324.75, 486.48 and 221.78 is: 332.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.75 : 486.48 = 221.78 : x
  2. Step 2: Convert to fraction form
    324.75/486.48 = 221.78/x
  3. Step 3: Cross multiply
    324.75x = 486.48 × 221.78
  4. Step 4: Simplify right side
    324.75x = 107,891.53
  5. Step 5: Solve for x
    x = 107,891.53/324.75
  6. Step 6: Final answer
    x = 332.23

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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.