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Finding the Fourth Proportional to 481.28, 722 and 139.28

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Solution

The fourth proportional to 481.28, 722 and 139.28 is: 208.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.28 : 722 = 139.28 : x
  2. Step 2: Convert to fraction form
    481.28/722 = 139.28/x
  3. Step 3: Cross multiply
    481.28x = 722 × 139.28
  4. Step 4: Simplify right side
    481.28x = 100,560.16
  5. Step 5: Solve for x
    x = 100,560.16/481.28
  6. Step 6: Final answer
    x = 208.94

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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.