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Finding the Fourth Proportional to 443.06, 663.98 and 321.56

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Solution

The fourth proportional to 443.06, 663.98 and 321.56 is: 481.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.06 : 663.98 = 321.56 : x
  2. Step 2: Convert to fraction form
    443.06/663.98 = 321.56/x
  3. Step 3: Cross multiply
    443.06x = 663.98 × 321.56
  4. Step 4: Simplify right side
    443.06x = 213,509.41
  5. Step 5: Solve for x
    x = 213,509.41/443.06
  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.