Home / 1,989.66-2,745.60-1,105.40

Finding the Fourth Proportional to 1,989.66, 2,745.60 and 1,105.40

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Solution

The fourth proportional to 1,989.66, 2,745.60 and 1,105.40 is: 1,525.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.66 : 2,745.60 = 1,105.40 : x
  2. Step 2: Convert to fraction form
    1,989.66/2,745.60 = 1,105.40/x
  3. Step 3: Cross multiply
    1,989.66x = 2,745.60 × 1,105.40
  4. Step 4: Simplify right side
    1,989.66x = 3,034,986.24
  5. Step 5: Solve for x
    x = 3,034,986.24/1,989.66
  6. Step 6: Final answer
    x = 1,525.38

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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.