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Finding the Fourth Proportional to 641.38, 879.34 and 629.71

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Solution

The fourth proportional to 641.38, 879.34 and 629.71 is: 863.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.38 : 879.34 = 629.71 : x
  2. Step 2: Convert to fraction form
    641.38/879.34 = 629.71/x
  3. Step 3: Cross multiply
    641.38x = 879.34 × 629.71
  4. Step 4: Simplify right side
    641.38x = 553,729.19
  5. Step 5: Solve for x
    x = 553,729.19/641.38
  6. Step 6: Final answer
    x = 863.34

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.