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Finding the Fourth Proportional to 636.92, 878.92 and 357.20

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Solution

The fourth proportional to 636.92, 878.92 and 357.20 is: 492.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.92 : 878.92 = 357.20 : x
  2. Step 2: Convert to fraction form
    636.92/878.92 = 357.20/x
  3. Step 3: Cross multiply
    636.92x = 878.92 × 357.20
  4. Step 4: Simplify right side
    636.92x = 313,944.04
  5. Step 5: Solve for x
    x = 313,944.04/636.92
  6. Step 6: Final answer
    x = 492.91

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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.