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Finding the Fourth Proportional to 636.86, 879.71 and 512.98

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Solution

The fourth proportional to 636.86, 879.71 and 512.98 is: 708.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.86 : 879.71 = 512.98 : x
  2. Step 2: Convert to fraction form
    636.86/879.71 = 512.98/x
  3. Step 3: Cross multiply
    636.86x = 879.71 × 512.98
  4. Step 4: Simplify right side
    636.86x = 451,268.87
  5. Step 5: Solve for x
    x = 451,268.87/636.86
  6. Step 6: Final answer
    x = 708.58

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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.