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Finding the Fourth Proportional to 321.53, 481.86 and 213.39

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Solution

The fourth proportional to 321.53, 481.86 and 213.39 is: 319.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.53 : 481.86 = 213.39 : x
  2. Step 2: Convert to fraction form
    321.53/481.86 = 213.39/x
  3. Step 3: Cross multiply
    321.53x = 481.86 × 213.39
  4. Step 4: Simplify right side
    321.53x = 102,824.11
  5. Step 5: Solve for x
    x = 102,824.11/321.53
  6. Step 6: Final answer
    x = 319.80

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.