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Finding the Fourth Proportional to 422.39, 630.79 and 361.03

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Solution

The fourth proportional to 422.39, 630.79 and 361.03 is: 539.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.39 : 630.79 = 361.03 : x
  2. Step 2: Convert to fraction form
    422.39/630.79 = 361.03/x
  3. Step 3: Cross multiply
    422.39x = 630.79 × 361.03
  4. Step 4: Simplify right side
    422.39x = 227,734.11
  5. Step 5: Solve for x
    x = 227,734.11/422.39
  6. Step 6: Final answer
    x = 539.16

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.