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Finding the Fourth Proportional to 422.91, 634.21 and 203.53

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Solution

The fourth proportional to 422.91, 634.21 and 203.53 is: 305.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.91 : 634.21 = 203.53 : x
  2. Step 2: Convert to fraction form
    422.91/634.21 = 203.53/x
  3. Step 3: Cross multiply
    422.91x = 634.21 × 203.53
  4. Step 4: Simplify right side
    422.91x = 129,080.76
  5. Step 5: Solve for x
    x = 129,080.76/422.91
  6. Step 6: Final answer
    x = 305.22

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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.