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Finding the Fourth Proportional to 636.92, 878.57 and 400.49

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Solution

The fourth proportional to 636.92, 878.57 and 400.49 is: 552.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.92 : 878.57 = 400.49 : x
  2. Step 2: Convert to fraction form
    636.92/878.57 = 400.49/x
  3. Step 3: Cross multiply
    636.92x = 878.57 × 400.49
  4. Step 4: Simplify right side
    636.92x = 351,858.05
  5. Step 5: Solve for x
    x = 351,858.05/636.92
  6. Step 6: Final answer
    x = 552.44

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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.