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Finding the Fourth Proportional to 636.87, 879.39 and 496.86

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Solution

The fourth proportional to 636.87, 879.39 and 496.86 is: 686.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.87 : 879.39 = 496.86 : x
  2. Step 2: Convert to fraction form
    636.87/879.39 = 496.86/x
  3. Step 3: Cross multiply
    636.87x = 879.39 × 496.86
  4. Step 4: Simplify right side
    636.87x = 436,933.72
  5. Step 5: Solve for x
    x = 436,933.72/636.87
  6. Step 6: Final answer
    x = 686.06

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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.