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Finding the Fourth Proportional to 321.20, 443.10 and 190.13

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Solution

The fourth proportional to 321.20, 443.10 and 190.13 is: 262.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.20 : 443.10 = 190.13 : x
  2. Step 2: Convert to fraction form
    321.20/443.10 = 190.13/x
  3. Step 3: Cross multiply
    321.20x = 443.10 × 190.13
  4. Step 4: Simplify right side
    321.20x = 84,244.39
  5. Step 5: Solve for x
    x = 84,244.39/321.20
  6. Step 6: Final answer
    x = 262.28

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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.