Home / 1,989.11-2,743.41-1,391.41

Finding the Fourth Proportional to 1,989.11, 2,743.41 and 1,391.41

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Solution

The fourth proportional to 1,989.11, 2,743.41 and 1,391.41 is: 1,919.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.11 : 2,743.41 = 1,391.41 : x
  2. Step 2: Convert to fraction form
    1,989.11/2,743.41 = 1,391.41/x
  3. Step 3: Cross multiply
    1,989.11x = 2,743.41 × 1,391.41
  4. Step 4: Simplify right side
    1,989.11x = 3,817,201.25
  5. Step 5: Solve for x
    x = 3,817,201.25/1,989.11
  6. Step 6: Final answer
    x = 1,919.05

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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.