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Finding the Fourth Proportional to 636.86, 878.78 and 371.35

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Solution

The fourth proportional to 636.86, 878.78 and 371.35 is: 512.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.86 : 878.78 = 371.35 : x
  2. Step 2: Convert to fraction form
    636.86/878.78 = 371.35/x
  3. Step 3: Cross multiply
    636.86x = 878.78 × 371.35
  4. Step 4: Simplify right side
    636.86x = 326,334.95
  5. Step 5: Solve for x
    x = 326,334.95/636.86
  6. Step 6: Final answer
    x = 512.42

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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.