Home / 1,989.40-2,745.38-1,105.18

Finding the Fourth Proportional to 1,989.40, 2,745.38 and 1,105.18

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Solution

The fourth proportional to 1,989.40, 2,745.38 and 1,105.18 is: 1,525.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.40 : 2,745.38 = 1,105.18 : x
  2. Step 2: Convert to fraction form
    1,989.40/2,745.38 = 1,105.18/x
  3. Step 3: Cross multiply
    1,989.40x = 2,745.38 × 1,105.18
  4. Step 4: Simplify right side
    1,989.40x = 3,034,139.07
  5. Step 5: Solve for x
    x = 3,034,139.07/1,989.40
  6. Step 6: Final answer
    x = 1,525.15

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1.5x scale

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.