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Finding the Fourth Proportional to 748.38, 1,121.82 and 286.08

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Solution

The fourth proportional to 748.38, 1,121.82 and 286.08 is: 428.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.38 : 1,121.82 = 286.08 : x
  2. Step 2: Convert to fraction form
    748.38/1,121.82 = 286.08/x
  3. Step 3: Cross multiply
    748.38x = 1,121.82 × 286.08
  4. Step 4: Simplify right side
    748.38x = 320,930.27
  5. Step 5: Solve for x
    x = 320,930.27/748.38
  6. Step 6: Final answer
    x = 428.83

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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.