Home / 1,380.44-2,067.47-831.41

Finding the Fourth Proportional to 1,380.44, 2,067.47 and 831.41

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Solution

The fourth proportional to 1,380.44, 2,067.47 and 831.41 is: 1,245.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.44 : 2,067.47 = 831.41 : x
  2. Step 2: Convert to fraction form
    1,380.44/2,067.47 = 831.41/x
  3. Step 3: Cross multiply
    1,380.44x = 2,067.47 × 831.41
  4. Step 4: Simplify right side
    1,380.44x = 1,718,920.40
  5. Step 5: Solve for x
    x = 1,718,920.40/1,380.44
  6. Step 6: Final answer
    x = 1,245.20

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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.