Home / 1,989.31-2,745.38-1,105.12

Finding the Fourth Proportional to 1,989.31, 2,745.38 and 1,105.12

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Solution

The fourth proportional to 1,989.31, 2,745.38 and 1,105.12 is: 1,525.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.31 : 2,745.38 = 1,105.12 : x
  2. Step 2: Convert to fraction form
    1,989.31/2,745.38 = 1,105.12/x
  3. Step 3: Cross multiply
    1,989.31x = 2,745.38 × 1,105.12
  4. Step 4: Simplify right side
    1,989.31x = 3,033,955.09
  5. Step 5: Solve for x
    x = 3,033,955.09/1,989.31
  6. Step 6: Final answer
    x = 1,525.13

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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.