Home / 1,961.28-2,921.40-1,891.44

Finding the Fourth Proportional to 1,961.28, 2,921.40 and 1,891.44

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Solution

The fourth proportional to 1,961.28, 2,921.40 and 1,891.44 is: 2,817.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,961.28 : 2,921.40 = 1,891.44 : x
  2. Step 2: Convert to fraction form
    1,961.28/2,921.40 = 1,891.44/x
  3. Step 3: Cross multiply
    1,961.28x = 2,921.40 × 1,891.44
  4. Step 4: Simplify right side
    1,961.28x = 5,525,652.82
  5. Step 5: Solve for x
    x = 5,525,652.82/1,961.28
  6. Step 6: Final answer
    x = 2,817.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.