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Finding the Fourth Proportional to 321.20, 443.06 and 190.18

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Solution

The fourth proportional to 321.20, 443.06 and 190.18 is: 262.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.20 : 443.06 = 190.18 : x
  2. Step 2: Convert to fraction form
    321.20/443.06 = 190.18/x
  3. Step 3: Cross multiply
    321.20x = 443.06 × 190.18
  4. Step 4: Simplify right side
    321.20x = 84,261.15
  5. Step 5: Solve for x
    x = 84,261.15/321.20
  6. Step 6: Final answer
    x = 262.33

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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.