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Finding the Fourth Proportional to 1,072.85, 1,609.27 and 748.44

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Solution

The fourth proportional to 1,072.85, 1,609.27 and 748.44 is: 1,122.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.85 : 1,609.27 = 748.44 : x
  2. Step 2: Convert to fraction form
    1,072.85/1,609.27 = 748.44/x
  3. Step 3: Cross multiply
    1,072.85x = 1,609.27 × 748.44
  4. Step 4: Simplify right side
    1,072.85x = 1,204,440.17
  5. Step 5: Solve for x
    x = 1,204,440.17/1,072.85
  6. Step 6: Final answer
    x = 1,122.66

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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.