Home / 1,961.20-2,943.42-1,387.72

Finding the Fourth Proportional to 1,961.20, 2,943.42 and 1,387.72

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Solution

The fourth proportional to 1,961.20, 2,943.42 and 1,387.72 is: 2,082.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,961.20 : 2,943.42 = 1,387.72 : x
  2. Step 2: Convert to fraction form
    1,961.20/2,943.42 = 1,387.72/x
  3. Step 3: Cross multiply
    1,961.20x = 2,943.42 × 1,387.72
  4. Step 4: Simplify right side
    1,961.20x = 4,084,642.80
  5. Step 5: Solve for x
    x = 4,084,642.80/1,961.20
  6. Step 6: Final answer
    x = 2,082.73

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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.