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Finding the Fourth Proportional to 321.23, 481.44 and 138.44

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Solution

The fourth proportional to 321.23, 481.44 and 138.44 is: 207.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.23 : 481.44 = 138.44 : x
  2. Step 2: Convert to fraction form
    321.23/481.44 = 138.44/x
  3. Step 3: Cross multiply
    321.23x = 481.44 × 138.44
  4. Step 4: Simplify right side
    321.23x = 66,652.28
  5. Step 5: Solve for x
    x = 66,652.28/321.23
  6. Step 6: Final answer
    x = 207.49

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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.