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Finding the Fourth Proportional to 636.69, 878.34 and 374.58

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Solution

The fourth proportional to 636.69, 878.34 and 374.58 is: 516.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.69 : 878.34 = 374.58 : x
  2. Step 2: Convert to fraction form
    636.69/878.34 = 374.58/x
  3. Step 3: Cross multiply
    636.69x = 878.34 × 374.58
  4. Step 4: Simplify right side
    636.69x = 329,008.60
  5. Step 5: Solve for x
    x = 329,008.60/636.69
  6. Step 6: Final answer
    x = 516.75

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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.