Home / 1,989.51-2,745.69-1,105.48

Finding the Fourth Proportional to 1,989.51, 2,745.69 and 1,105.48

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Solution

The fourth proportional to 1,989.51, 2,745.69 and 1,105.48 is: 1,525.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.51 : 2,745.69 = 1,105.48 : x
  2. Step 2: Convert to fraction form
    1,989.51/2,745.69 = 1,105.48/x
  3. Step 3: Cross multiply
    1,989.51x = 2,745.69 × 1,105.48
  4. Step 4: Simplify right side
    1,989.51x = 3,035,305.38
  5. Step 5: Solve for x
    x = 3,035,305.38/1,989.51
  6. Step 6: Final answer
    x = 1,525.65

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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.