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Finding the Fourth Proportional to 2,651.48, 3,979.07 and 920.11

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Solution

The fourth proportional to 2,651.48, 3,979.07 and 920.11 is: 1,380.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,651.48 : 3,979.07 = 920.11 : x
  2. Step 2: Convert to fraction form
    2,651.48/3,979.07 = 920.11/x
  3. Step 3: Cross multiply
    2,651.48x = 3,979.07 × 920.11
  4. Step 4: Simplify right side
    2,651.48x = 3,661,183.64
  5. Step 5: Solve for x
    x = 3,661,183.64/2,651.48
  6. Step 6: Final answer
    x = 1,380.81

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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.