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Finding the Fourth Proportional to 443.09, 664.35 and 321.45

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Solution

The fourth proportional to 443.09, 664.35 and 321.45 is: 481.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.09 : 664.35 = 321.45 : x
  2. Step 2: Convert to fraction form
    443.09/664.35 = 321.45/x
  3. Step 3: Cross multiply
    443.09x = 664.35 × 321.45
  4. Step 4: Simplify right side
    443.09x = 213,555.31
  5. Step 5: Solve for x
    x = 213,555.31/443.09
  6. Step 6: Final answer
    x = 481.97

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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.