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Finding the Fourth Proportional to 636.60, 878.22 and 447.54

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Solution

The fourth proportional to 636.60, 878.22 and 447.54 is: 617.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.60 : 878.22 = 447.54 : x
  2. Step 2: Convert to fraction form
    636.60/878.22 = 447.54/x
  3. Step 3: Cross multiply
    636.60x = 878.22 × 447.54
  4. Step 4: Simplify right side
    636.60x = 393,038.58
  5. Step 5: Solve for x
    x = 393,038.58/636.60
  6. Step 6: Final answer
    x = 617.40

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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.