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Finding the Fourth Proportional to 424.49, 636.19 and 321.45

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Solution

The fourth proportional to 424.49, 636.19 and 321.45 is: 481.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.49 : 636.19 = 321.45 : x
  2. Step 2: Convert to fraction form
    424.49/636.19 = 321.45/x
  3. Step 3: Cross multiply
    424.49x = 636.19 × 321.45
  4. Step 4: Simplify right side
    424.49x = 204,500.09
  5. Step 5: Solve for x
    x = 204,500.09/424.49
  6. Step 6: Final answer
    x = 481.76

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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.