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Finding the Fourth Proportional to 422.10, 581.04 and 356.22

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Solution

The fourth proportional to 422.10, 581.04 and 356.22 is: 490.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.10 : 581.04 = 356.22 : x
  2. Step 2: Convert to fraction form
    422.10/581.04 = 356.22/x
  3. Step 3: Cross multiply
    422.10x = 581.04 × 356.22
  4. Step 4: Simplify right side
    422.10x = 206,978.07
  5. Step 5: Solve for x
    x = 206,978.07/422.10
  6. Step 6: Final answer
    x = 490.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.