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Finding the Fourth Proportional to 321.46, 481.86 and 138.82

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Solution

The fourth proportional to 321.46, 481.86 and 138.82 is: 208.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.46 : 481.86 = 138.82 : x
  2. Step 2: Convert to fraction form
    321.46/481.86 = 138.82/x
  3. Step 3: Cross multiply
    321.46x = 481.86 × 138.82
  4. Step 4: Simplify right side
    321.46x = 66,891.81
  5. Step 5: Solve for x
    x = 66,891.81/321.46
  6. Step 6: Final answer
    x = 208.09

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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.