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Finding the Fourth Proportional to 2,640.32, 3,960.70 and 791.30

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Solution

The fourth proportional to 2,640.32, 3,960.70 and 791.30 is: 1,187.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,640.32 : 3,960.70 = 791.30 : x
  2. Step 2: Convert to fraction form
    2,640.32/3,960.70 = 791.30/x
  3. Step 3: Cross multiply
    2,640.32x = 3,960.70 × 791.30
  4. Step 4: Simplify right side
    2,640.32x = 3,134,101.91
  5. Step 5: Solve for x
    x = 3,134,101.91/2,640.32
  6. Step 6: Final answer
    x = 1,187.02

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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.