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Finding the Fourth Proportional to 1,906.37, 2,860.99 and 811.49

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Solution

The fourth proportional to 1,906.37, 2,860.99 and 811.49 is: 1,217.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,906.37 : 2,860.99 = 811.49 : x
  2. Step 2: Convert to fraction form
    1,906.37/2,860.99 = 811.49/x
  3. Step 3: Cross multiply
    1,906.37x = 2,860.99 × 811.49
  4. Step 4: Simplify right side
    1,906.37x = 2,321,660.72
  5. Step 5: Solve for x
    x = 2,321,660.72/1,906.37
  6. Step 6: Final answer
    x = 1,217.85

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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.