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Finding the Fourth Proportional to 639.17, 881.56 and 481.82

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Solution

The fourth proportional to 639.17, 881.56 and 481.82 is: 664.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.17 : 881.56 = 481.82 : x
  2. Step 2: Convert to fraction form
    639.17/881.56 = 481.82/x
  3. Step 3: Cross multiply
    639.17x = 881.56 × 481.82
  4. Step 4: Simplify right side
    639.17x = 424,755.52
  5. Step 5: Solve for x
    x = 424,755.52/639.17
  6. Step 6: Final answer
    x = 664.55

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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.