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Finding the Fourth Proportional to 680.52, 939.28 and 447.96

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Solution

The fourth proportional to 680.52, 939.28 and 447.96 is: 618.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.52 : 939.28 = 447.96 : x
  2. Step 2: Convert to fraction form
    680.52/939.28 = 447.96/x
  3. Step 3: Cross multiply
    680.52x = 939.28 × 447.96
  4. Step 4: Simplify right side
    680.52x = 420,759.87
  5. Step 5: Solve for x
    x = 420,759.87/680.52
  6. Step 6: Final answer
    x = 618.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.