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Finding the Fourth Proportional to 636.67, 878.64 and 356.90

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Solution

The fourth proportional to 636.67, 878.64 and 356.90 is: 492.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.67 : 878.64 = 356.90 : x
  2. Step 2: Convert to fraction form
    636.67/878.64 = 356.90/x
  3. Step 3: Cross multiply
    636.67x = 878.64 × 356.90
  4. Step 4: Simplify right side
    636.67x = 313,586.86
  5. Step 5: Solve for x
    x = 313,586.86/636.67
  6. Step 6: Final answer
    x = 492.54

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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.