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Finding the Fourth Proportional to 422.93, 634.08 and 203.55

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Solution

The fourth proportional to 422.93, 634.08 and 203.55 is: 305.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.93 : 634.08 = 203.55 : x
  2. Step 2: Convert to fraction form
    422.93/634.08 = 203.55/x
  3. Step 3: Cross multiply
    422.93x = 634.08 × 203.55
  4. Step 4: Simplify right side
    422.93x = 129,066.98
  5. Step 5: Solve for x
    x = 129,066.98/422.93
  6. Step 6: Final answer
    x = 305.18

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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.