Home / 1,912.68-2,640.60-1,284.12

Finding the Fourth Proportional to 1,912.68, 2,640.60 and 1,284.12

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Solution

The fourth proportional to 1,912.68, 2,640.60 and 1,284.12 is: 1,772.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.68 : 2,640.60 = 1,284.12 : x
  2. Step 2: Convert to fraction form
    1,912.68/2,640.60 = 1,284.12/x
  3. Step 3: Cross multiply
    1,912.68x = 2,640.60 × 1,284.12
  4. Step 4: Simplify right side
    1,912.68x = 3,390,847.27
  5. Step 5: Solve for x
    x = 3,390,847.27/1,912.68
  6. Step 6: Final answer
    x = 1,772.83

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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.