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Finding the Fourth Proportional to 2,640.17, 3,960.09 and 791.33

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Solution

The fourth proportional to 2,640.17, 3,960.09 and 791.33 is: 1,186.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,640.17 : 3,960.09 = 791.33 : x
  2. Step 2: Convert to fraction form
    2,640.17/3,960.09 = 791.33/x
  3. Step 3: Cross multiply
    2,640.17x = 3,960.09 × 791.33
  4. Step 4: Simplify right side
    2,640.17x = 3,133,721.19
  5. Step 5: Solve for x
    x = 3,133,721.19/2,640.17
  6. Step 6: Final answer
    x = 1,186.94

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1.5x scale

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.