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Finding the Fourth Proportional to 2,640.79, 3,960.06 and 1,079.71

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Solution

The fourth proportional to 2,640.79, 3,960.06 and 1,079.71 is: 1,619.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,640.79 : 3,960.06 = 1,079.71 : x
  2. Step 2: Convert to fraction form
    2,640.79/3,960.06 = 1,079.71/x
  3. Step 3: Cross multiply
    2,640.79x = 3,960.06 × 1,079.71
  4. Step 4: Simplify right side
    2,640.79x = 4,275,716.38
  5. Step 5: Solve for x
    x = 4,275,716.38/2,640.79
  6. Step 6: Final answer
    x = 1,619.11

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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.