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Finding the Fourth Proportional to 321.57, 481.95 and 139.12

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Solution

The fourth proportional to 321.57, 481.95 and 139.12 is: 208.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.57 : 481.95 = 139.12 : x
  2. Step 2: Convert to fraction form
    321.57/481.95 = 139.12/x
  3. Step 3: Cross multiply
    321.57x = 481.95 × 139.12
  4. Step 4: Simplify right side
    321.57x = 67,047.68
  5. Step 5: Solve for x
    x = 67,047.68/321.57
  6. Step 6: Final answer
    x = 208.50

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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.