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Finding the Fourth Proportional to 2,640.92, 3,961.36 and 792

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Solution

The fourth proportional to 2,640.92, 3,961.36 and 792 is: 1,187.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,640.92 : 3,961.36 = 792 : x
  2. Step 2: Convert to fraction form
    2,640.92/3,961.36 = 792/x
  3. Step 3: Cross multiply
    2,640.92x = 3,961.36 × 792
  4. Step 4: Simplify right side
    2,640.92x = 3,137,397.12
  5. Step 5: Solve for x
    x = 3,137,397.12/2,640.92
  6. Step 6: Final answer
    x = 1,187.99

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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.