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Finding the Fourth Proportional to 1,912.95, 2,640.43 and 1,249.90

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Solution

The fourth proportional to 1,912.95, 2,640.43 and 1,249.90 is: 1,725.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.95 : 2,640.43 = 1,249.90 : x
  2. Step 2: Convert to fraction form
    1,912.95/2,640.43 = 1,249.90/x
  3. Step 3: Cross multiply
    1,912.95x = 2,640.43 × 1,249.90
  4. Step 4: Simplify right side
    1,912.95x = 3,300,263.73
  5. Step 5: Solve for x
    x = 3,300,263.73/1,912.95
  6. Step 6: Final answer
    x = 1,725.22

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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.