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Finding the Fourth Proportional to 423.74, 634.46 and 218.25

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Solution

The fourth proportional to 423.74, 634.46 and 218.25 is: 326.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.74 : 634.46 = 218.25 : x
  2. Step 2: Convert to fraction form
    423.74/634.46 = 218.25/x
  3. Step 3: Cross multiply
    423.74x = 634.46 × 218.25
  4. Step 4: Simplify right side
    423.74x = 138,469.80
  5. Step 5: Solve for x
    x = 138,469.80/423.74
  6. Step 6: Final answer
    x = 326.78

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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.