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Finding the Fourth Proportional to 1,072.20, 1,611 and 682.38

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Solution

The fourth proportional to 1,072.20, 1,611 and 682.38 is: 1,025.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.20 : 1,611 = 682.38 : x
  2. Step 2: Convert to fraction form
    1,072.20/1,611 = 682.38/x
  3. Step 3: Cross multiply
    1,072.20x = 1,611 × 682.38
  4. Step 4: Simplify right side
    1,072.20x = 1,099,314.18
  5. Step 5: Solve for x
    x = 1,099,314.18/1,072.20
  6. Step 6: Final answer
    x = 1,025.29

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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.