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Finding the Fourth Proportional to 321.54, 481.78 and 199.59

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Solution

The fourth proportional to 321.54, 481.78 and 199.59 is: 299.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.54 : 481.78 = 199.59 : x
  2. Step 2: Convert to fraction form
    321.54/481.78 = 199.59/x
  3. Step 3: Cross multiply
    321.54x = 481.78 × 199.59
  4. Step 4: Simplify right side
    321.54x = 96,158.47
  5. Step 5: Solve for x
    x = 96,158.47/321.54
  6. Step 6: Final answer
    x = 299.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.