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Finding the Fourth Proportional to 422.94, 634.87 and 355.21

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Solution

The fourth proportional to 422.94, 634.87 and 355.21 is: 533.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.94 : 634.87 = 355.21 : x
  2. Step 2: Convert to fraction form
    422.94/634.87 = 355.21/x
  3. Step 3: Cross multiply
    422.94x = 634.87 × 355.21
  4. Step 4: Simplify right side
    422.94x = 225,507.22
  5. Step 5: Solve for x
    x = 225,507.22/422.94
  6. Step 6: Final answer
    x = 533.19

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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.