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Finding the Fourth Proportional to 321.39, 443.60 and 190.43

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Solution

The fourth proportional to 321.39, 443.60 and 190.43 is: 262.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.39 : 443.60 = 190.43 : x
  2. Step 2: Convert to fraction form
    321.39/443.60 = 190.43/x
  3. Step 3: Cross multiply
    321.39x = 443.60 × 190.43
  4. Step 4: Simplify right side
    321.39x = 84,471.58
  5. Step 5: Solve for x
    x = 84,471.58/321.39
  6. Step 6: Final answer
    x = 262.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.