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Finding the Fourth Proportional to 2,640.77, 3,961.13 and 791.90

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Solution

The fourth proportional to 2,640.77, 3,961.13 and 791.90 is: 1,187.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,640.77 : 3,961.13 = 791.90 : x
  2. Step 2: Convert to fraction form
    2,640.77/3,961.13 = 791.90/x
  3. Step 3: Cross multiply
    2,640.77x = 3,961.13 × 791.90
  4. Step 4: Simplify right side
    2,640.77x = 3,136,795.08
  5. Step 5: Solve for x
    x = 3,136,795.08/2,640.77
  6. Step 6: Final answer
    x = 1,187.84

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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.