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Finding the Fourth Proportional to 443.70, 664.74 and 321.66

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Solution

The fourth proportional to 443.70, 664.74 and 321.66 is: 481.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.70 : 664.74 = 321.66 : x
  2. Step 2: Convert to fraction form
    443.70/664.74 = 321.66/x
  3. Step 3: Cross multiply
    443.70x = 664.74 × 321.66
  4. Step 4: Simplify right side
    443.70x = 213,820.27
  5. Step 5: Solve for x
    x = 213,820.27/443.70
  6. Step 6: Final answer
    x = 481.90

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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.