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Finding the Fourth Proportional to 1,072.20, 1,608.76 and 422.80

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Solution

The fourth proportional to 1,072.20, 1,608.76 and 422.80 is: 634.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.20 : 1,608.76 = 422.80 : x
  2. Step 2: Convert to fraction form
    1,072.20/1,608.76 = 422.80/x
  3. Step 3: Cross multiply
    1,072.20x = 1,608.76 × 422.80
  4. Step 4: Simplify right side
    1,072.20x = 680,183.73
  5. Step 5: Solve for x
    x = 680,183.73/1,072.20
  6. Step 6: Final answer
    x = 634.38

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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.