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Finding the Fourth Proportional to 422.12, 581.94 and 290.90

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Solution

The fourth proportional to 422.12, 581.94 and 290.90 is: 401.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.12 : 581.94 = 290.90 : x
  2. Step 2: Convert to fraction form
    422.12/581.94 = 290.90/x
  3. Step 3: Cross multiply
    422.12x = 581.94 × 290.90
  4. Step 4: Simplify right side
    422.12x = 169,283.44
  5. Step 5: Solve for x
    x = 169,283.44/422.12
  6. Step 6: Final answer
    x = 401.04

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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.