Home / 1,989.42-2,745.78-1,203.90

Finding the Fourth Proportional to 1,989.42, 2,745.78 and 1,203.90

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Solution

The fourth proportional to 1,989.42, 2,745.78 and 1,203.90 is: 1,661.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.42 : 2,745.78 = 1,203.90 : x
  2. Step 2: Convert to fraction form
    1,989.42/2,745.78 = 1,203.90/x
  3. Step 3: Cross multiply
    1,989.42x = 2,745.78 × 1,203.90
  4. Step 4: Simplify right side
    1,989.42x = 3,305,644.54
  5. Step 5: Solve for x
    x = 3,305,644.54/1,989.42
  6. Step 6: Final answer
    x = 1,661.61

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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.