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Finding the Fourth Proportional to 324.44, 485.76 and 221.54

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Solution

The fourth proportional to 324.44, 485.76 and 221.54 is: 331.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.44 : 485.76 = 221.54 : x
  2. Step 2: Convert to fraction form
    324.44/485.76 = 221.54/x
  3. Step 3: Cross multiply
    324.44x = 485.76 × 221.54
  4. Step 4: Simplify right side
    324.44x = 107,615.27
  5. Step 5: Solve for x
    x = 107,615.27/324.44
  6. Step 6: Final answer
    x = 331.70

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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.