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Finding the Fourth Proportional to 321.69, 443.89 and 190.78

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Solution

The fourth proportional to 321.69, 443.89 and 190.78 is: 263.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.69 : 443.89 = 190.78 : x
  2. Step 2: Convert to fraction form
    321.69/443.89 = 190.78/x
  3. Step 3: Cross multiply
    321.69x = 443.89 × 190.78
  4. Step 4: Simplify right side
    321.69x = 84,685.33
  5. Step 5: Solve for x
    x = 84,685.33/321.69
  6. Step 6: Final answer
    x = 263.25

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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.