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Finding the Fourth Proportional to 636.87, 953.26 and 415.72

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Solution

The fourth proportional to 636.87, 953.26 and 415.72 is: 622.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.87 : 953.26 = 415.72 : x
  2. Step 2: Convert to fraction form
    636.87/953.26 = 415.72/x
  3. Step 3: Cross multiply
    636.87x = 953.26 × 415.72
  4. Step 4: Simplify right side
    636.87x = 396,289.25
  5. Step 5: Solve for x
    x = 396,289.25/636.87
  6. Step 6: Final answer
    x = 622.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.