Home / 1,991.31-2,986.97-1,261.10

Finding the Fourth Proportional to 1,991.31, 2,986.97 and 1,261.10

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Solution

The fourth proportional to 1,991.31, 2,986.97 and 1,261.10 is: 1,891.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.31 : 2,986.97 = 1,261.10 : x
  2. Step 2: Convert to fraction form
    1,991.31/2,986.97 = 1,261.10/x
  3. Step 3: Cross multiply
    1,991.31x = 2,986.97 × 1,261.10
  4. Step 4: Simplify right side
    1,991.31x = 3,766,846.63
  5. Step 5: Solve for x
    x = 3,766,846.63/1,991.31
  6. Step 6: Final answer
    x = 1,891.64

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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.