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Finding the Fourth Proportional to 321.12, 443.07 and 190.17

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Solution

The fourth proportional to 321.12, 443.07 and 190.17 is: 262.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.12 : 443.07 = 190.17 : x
  2. Step 2: Convert to fraction form
    321.12/443.07 = 190.17/x
  3. Step 3: Cross multiply
    321.12x = 443.07 × 190.17
  4. Step 4: Simplify right side
    321.12x = 84,258.62
  5. Step 5: Solve for x
    x = 84,258.62/321.12
  6. Step 6: Final answer
    x = 262.39

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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.