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Finding the Fourth Proportional to 636.76, 878.88 and 403.75

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Solution

The fourth proportional to 636.76, 878.88 and 403.75 is: 557.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.76 : 878.88 = 403.75 : x
  2. Step 2: Convert to fraction form
    636.76/878.88 = 403.75/x
  3. Step 3: Cross multiply
    636.76x = 878.88 × 403.75
  4. Step 4: Simplify right side
    636.76x = 354,847.80
  5. Step 5: Solve for x
    x = 354,847.80/636.76
  6. Step 6: Final answer
    x = 557.27

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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.