Home / 1,989.76-2,745.66-1,105.42

Finding the Fourth Proportional to 1,989.76, 2,745.66 and 1,105.42

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Solution

The fourth proportional to 1,989.76, 2,745.66 and 1,105.42 is: 1,525.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.76 : 2,745.66 = 1,105.42 : x
  2. Step 2: Convert to fraction form
    1,989.76/2,745.66 = 1,105.42/x
  3. Step 3: Cross multiply
    1,989.76x = 2,745.66 × 1,105.42
  4. Step 4: Simplify right side
    1,989.76x = 3,035,107.48
  5. Step 5: Solve for x
    x = 3,035,107.48/1,989.76
  6. Step 6: Final answer
    x = 1,525.36

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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.