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Finding the Fourth Proportional to 324.28, 485.26 and 281.09

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Solution

The fourth proportional to 324.28, 485.26 and 281.09 is: 420.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.28 : 485.26 = 281.09 : x
  2. Step 2: Convert to fraction form
    324.28/485.26 = 281.09/x
  3. Step 3: Cross multiply
    324.28x = 485.26 × 281.09
  4. Step 4: Simplify right side
    324.28x = 136,401.73
  5. Step 5: Solve for x
    x = 136,401.73/324.28
  6. Step 6: Final answer
    x = 420.63

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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.