Home / 2,138.26-3,205.55-839.42

Finding the Fourth Proportional to 2,138.26, 3,205.55 and 839.42

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Solution

The fourth proportional to 2,138.26, 3,205.55 and 839.42 is: 1,258.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.26 : 3,205.55 = 839.42 : x
  2. Step 2: Convert to fraction form
    2,138.26/3,205.55 = 839.42/x
  3. Step 3: Cross multiply
    2,138.26x = 3,205.55 × 839.42
  4. Step 4: Simplify right side
    2,138.26x = 2,690,802.78
  5. Step 5: Solve for x
    x = 2,690,802.78/2,138.26
  6. Step 6: Final answer
    x = 1,258.41

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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.