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Finding the Fourth Proportional to 422.24, 630.32 and 391.36

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Solution

The fourth proportional to 422.24, 630.32 and 391.36 is: 584.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.24 : 630.32 = 391.36 : x
  2. Step 2: Convert to fraction form
    422.24/630.32 = 391.36/x
  3. Step 3: Cross multiply
    422.24x = 630.32 × 391.36
  4. Step 4: Simplify right side
    422.24x = 246,682.04
  5. Step 5: Solve for x
    x = 246,682.04/422.24
  6. Step 6: Final answer
    x = 584.22

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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.