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Finding the Fourth Proportional to 2,691, 3,709.74 and 1,906.84

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Solution

The fourth proportional to 2,691, 3,709.74 and 1,906.84 is: 2,628.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,691 : 3,709.74 = 1,906.84 : x
  2. Step 2: Convert to fraction form
    2,691/3,709.74 = 1,906.84/x
  3. Step 3: Cross multiply
    2,691x = 3,709.74 × 1,906.84
  4. Step 4: Simplify right side
    2,691x = 7,073,880.62
  5. Step 5: Solve for x
    x = 7,073,880.62/2,691
  6. Step 6: Final answer
    x = 2,628.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.