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Finding the Fourth Proportional to 1,906.65, 2,858.11 and 919.19

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Solution

The fourth proportional to 1,906.65, 2,858.11 and 919.19 is: 1,377.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,906.65 : 2,858.11 = 919.19 : x
  2. Step 2: Convert to fraction form
    1,906.65/2,858.11 = 919.19/x
  3. Step 3: Cross multiply
    1,906.65x = 2,858.11 × 919.19
  4. Step 4: Simplify right side
    1,906.65x = 2,627,150.98
  5. Step 5: Solve for x
    x = 2,627,150.98/1,906.65
  6. Step 6: Final answer
    x = 1,377.89

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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.