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Finding the Fourth Proportional to 2,107.92, 3,161.87 and 721.26

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Solution

The fourth proportional to 2,107.92, 3,161.87 and 721.26 is: 1,081.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,107.92 : 3,161.87 = 721.26 : x
  2. Step 2: Convert to fraction form
    2,107.92/3,161.87 = 721.26/x
  3. Step 3: Cross multiply
    2,107.92x = 3,161.87 × 721.26
  4. Step 4: Simplify right side
    2,107.92x = 2,280,530.36
  5. Step 5: Solve for x
    x = 2,280,530.36/2,107.92
  6. Step 6: Final answer
    x = 1,081.89

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Similar ratio
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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.