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Finding the Fourth Proportional to 2,919.39, 4,378.41 and 839.38

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Solution

The fourth proportional to 2,919.39, 4,378.41 and 839.38 is: 1,258.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,919.39 : 4,378.41 = 839.38 : x
  2. Step 2: Convert to fraction form
    2,919.39/4,378.41 = 839.38/x
  3. Step 3: Cross multiply
    2,919.39x = 4,378.41 × 839.38
  4. Step 4: Simplify right side
    2,919.39x = 3,675,149.79
  5. Step 5: Solve for x
    x = 3,675,149.79/2,919.39
  6. Step 6: Final answer
    x = 1,258.88

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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.