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Finding the Fourth Proportional to 2,138.60, 3,198.90 and 1,920.80

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Solution

The fourth proportional to 2,138.60, 3,198.90 and 1,920.80 is: 2,873.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.60 : 3,198.90 = 1,920.80 : x
  2. Step 2: Convert to fraction form
    2,138.60/3,198.90 = 1,920.80/x
  3. Step 3: Cross multiply
    2,138.60x = 3,198.90 × 1,920.80
  4. Step 4: Simplify right side
    2,138.60x = 6,144,447.12
  5. Step 5: Solve for x
    x = 6,144,447.12/2,138.60
  6. Step 6: Final answer
    x = 2,873.12

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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.