Home / 2,112.90-3,169.67-1,138.47

Finding the Fourth Proportional to 2,112.90, 3,169.67 and 1,138.47

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Solution

The fourth proportional to 2,112.90, 3,169.67 and 1,138.47 is: 1,707.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,112.90 : 3,169.67 = 1,138.47 : x
  2. Step 2: Convert to fraction form
    2,112.90/3,169.67 = 1,138.47/x
  3. Step 3: Cross multiply
    2,112.90x = 3,169.67 × 1,138.47
  4. Step 4: Simplify right side
    2,112.90x = 3,608,568.51
  5. Step 5: Solve for x
    x = 3,608,568.51/2,112.90
  6. Step 6: Final answer
    x = 1,707.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.