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Finding the Fourth Proportional to 422.87, 635.04 and 405.86

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Solution

The fourth proportional to 422.87, 635.04 and 405.86 is: 609.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.87 : 635.04 = 405.86 : x
  2. Step 2: Convert to fraction form
    422.87/635.04 = 405.86/x
  3. Step 3: Cross multiply
    422.87x = 635.04 × 405.86
  4. Step 4: Simplify right side
    422.87x = 257,734.16
  5. Step 5: Solve for x
    x = 257,734.16/422.87
  6. Step 6: Final answer
    x = 609.50

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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.