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Finding the Fourth Proportional to 636.78, 878.96 and 374.70

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Solution

The fourth proportional to 636.78, 878.96 and 374.70 is: 517.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.78 : 878.96 = 374.70 : x
  2. Step 2: Convert to fraction form
    636.78/878.96 = 374.70/x
  3. Step 3: Cross multiply
    636.78x = 878.96 × 374.70
  4. Step 4: Simplify right side
    636.78x = 329,346.31
  5. Step 5: Solve for x
    x = 329,346.31/636.78
  6. Step 6: Final answer
    x = 517.21

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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.