Home / 1,989.57-2,745.66-1,105.45

Finding the Fourth Proportional to 1,989.57, 2,745.66 and 1,105.45

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Solution

The fourth proportional to 1,989.57, 2,745.66 and 1,105.45 is: 1,525.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.57 : 2,745.66 = 1,105.45 : x
  2. Step 2: Convert to fraction form
    1,989.57/2,745.66 = 1,105.45/x
  3. Step 3: Cross multiply
    1,989.57x = 2,745.66 × 1,105.45
  4. Step 4: Simplify right side
    1,989.57x = 3,035,189.85
  5. Step 5: Solve for x
    x = 3,035,189.85/1,989.57
  6. Step 6: Final answer
    x = 1,525.55

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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.