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Finding the Fourth Proportional to 636.74, 878.74 and 415.88

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Solution

The fourth proportional to 636.74, 878.74 and 415.88 is: 573.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.74 : 878.74 = 415.88 : x
  2. Step 2: Convert to fraction form
    636.74/878.74 = 415.88/x
  3. Step 3: Cross multiply
    636.74x = 878.74 × 415.88
  4. Step 4: Simplify right side
    636.74x = 365,450.39
  5. Step 5: Solve for x
    x = 365,450.39/636.74
  6. Step 6: Final answer
    x = 573.94

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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.