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Finding the Fourth Proportional to 422.61, 634.02 and 206.18

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Solution

The fourth proportional to 422.61, 634.02 and 206.18 is: 309.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.61 : 634.02 = 206.18 : x
  2. Step 2: Convert to fraction form
    422.61/634.02 = 206.18/x
  3. Step 3: Cross multiply
    422.61x = 634.02 × 206.18
  4. Step 4: Simplify right side
    422.61x = 130,722.24
  5. Step 5: Solve for x
    x = 130,722.24/422.61
  6. Step 6: Final answer
    x = 309.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.