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Finding the Fourth Proportional to 636.80, 879.64 and 512.94

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Solution

The fourth proportional to 636.80, 879.64 and 512.94 is: 708.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.80 : 879.64 = 512.94 : x
  2. Step 2: Convert to fraction form
    636.80/879.64 = 512.94/x
  3. Step 3: Cross multiply
    636.80x = 879.64 × 512.94
  4. Step 4: Simplify right side
    636.80x = 451,202.54
  5. Step 5: Solve for x
    x = 451,202.54/636.80
  6. Step 6: Final answer
    x = 708.55

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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.