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Finding the Fourth Proportional to 2,138.90, 3,206.55 and 1,112.90

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Solution

The fourth proportional to 2,138.90, 3,206.55 and 1,112.90 is: 1,668.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.90 : 3,206.55 = 1,112.90 : x
  2. Step 2: Convert to fraction form
    2,138.90/3,206.55 = 1,112.90/x
  3. Step 3: Cross multiply
    2,138.90x = 3,206.55 × 1,112.90
  4. Step 4: Simplify right side
    2,138.90x = 3,568,569.50
  5. Step 5: Solve for x
    x = 3,568,569.50/2,138.90
  6. Step 6: Final answer
    x = 1,668.41

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1.5x scale

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.