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Finding the Fourth Proportional to 422.10, 582.29 and 289.29

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Solution

The fourth proportional to 422.10, 582.29 and 289.29 is: 399.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.10 : 582.29 = 289.29 : x
  2. Step 2: Convert to fraction form
    422.10/582.29 = 289.29/x
  3. Step 3: Cross multiply
    422.10x = 582.29 × 289.29
  4. Step 4: Simplify right side
    422.10x = 168,449.23
  5. Step 5: Solve for x
    x = 168,449.23/422.10
  6. Step 6: Final answer
    x = 399.07

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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.