Home / 1,912.92-2,639.37-1,213.89

Finding the Fourth Proportional to 1,912.92, 2,639.37 and 1,213.89

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Solution

The fourth proportional to 1,912.92, 2,639.37 and 1,213.89 is: 1,674.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.92 : 2,639.37 = 1,213.89 : x
  2. Step 2: Convert to fraction form
    1,912.92/2,639.37 = 1,213.89/x
  3. Step 3: Cross multiply
    1,912.92x = 2,639.37 × 1,213.89
  4. Step 4: Simplify right side
    1,912.92x = 3,203,904.85
  5. Step 5: Solve for x
    x = 3,203,904.85/1,912.92
  6. Step 6: Final answer
    x = 1,674.88

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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.