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Finding the Fourth Proportional to 422.19, 582.18 and 343.80

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Solution

The fourth proportional to 422.19, 582.18 and 343.80 is: 474.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.19 : 582.18 = 343.80 : x
  2. Step 2: Convert to fraction form
    422.19/582.18 = 343.80/x
  3. Step 3: Cross multiply
    422.19x = 582.18 × 343.80
  4. Step 4: Simplify right side
    422.19x = 200,153.48
  5. Step 5: Solve for x
    x = 200,153.48/422.19
  6. Step 6: Final answer
    x = 474.08

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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.