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Finding the Fourth Proportional to 638.82, 879.46 and 573.21

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Solution

The fourth proportional to 638.82, 879.46 and 573.21 is: 789.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.82 : 879.46 = 573.21 : x
  2. Step 2: Convert to fraction form
    638.82/879.46 = 573.21/x
  3. Step 3: Cross multiply
    638.82x = 879.46 × 573.21
  4. Step 4: Simplify right side
    638.82x = 504,113.83
  5. Step 5: Solve for x
    x = 504,113.83/638.82
  6. Step 6: Final answer
    x = 789.13

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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.