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Finding the Fourth Proportional to 636.26, 878.88 and 490.72

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Solution

The fourth proportional to 636.26, 878.88 and 490.72 is: 677.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.26 : 878.88 = 490.72 : x
  2. Step 2: Convert to fraction form
    636.26/878.88 = 490.72/x
  3. Step 3: Cross multiply
    636.26x = 878.88 × 490.72
  4. Step 4: Simplify right side
    636.26x = 431,283.99
  5. Step 5: Solve for x
    x = 431,283.99/636.26
  6. Step 6: Final answer
    x = 677.84

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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.