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Finding the Fourth Proportional to 321.50, 481.92 and 139.01

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Solution

The fourth proportional to 321.50, 481.92 and 139.01 is: 208.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.50 : 481.92 = 139.01 : x
  2. Step 2: Convert to fraction form
    321.50/481.92 = 139.01/x
  3. Step 3: Cross multiply
    321.50x = 481.92 × 139.01
  4. Step 4: Simplify right side
    321.50x = 66,991.70
  5. Step 5: Solve for x
    x = 66,991.70/321.50
  6. Step 6: Final answer
    x = 208.37

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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.