Home / 1,378.26-2,077.71-1,286.60

Finding the Fourth Proportional to 1,378.26, 2,077.71 and 1,286.60

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Solution

The fourth proportional to 1,378.26, 2,077.71 and 1,286.60 is: 1,939.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.26 : 2,077.71 = 1,286.60 : x
  2. Step 2: Convert to fraction form
    1,378.26/2,077.71 = 1,286.60/x
  3. Step 3: Cross multiply
    1,378.26x = 2,077.71 × 1,286.60
  4. Step 4: Simplify right side
    1,378.26x = 2,673,186.88
  5. Step 5: Solve for x
    x = 2,673,186.88/1,378.26
  6. Step 6: Final answer
    x = 1,939.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.