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Finding the Fourth Proportional to 1,391.06, 1,919.47 and 831.41

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Solution

The fourth proportional to 1,391.06, 1,919.47 and 831.41 is: 1,147.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.06 : 1,919.47 = 831.41 : x
  2. Step 2: Convert to fraction form
    1,391.06/1,919.47 = 831.41/x
  3. Step 3: Cross multiply
    1,391.06x = 1,919.47 × 831.41
  4. Step 4: Simplify right side
    1,391.06x = 1,595,854.88
  5. Step 5: Solve for x
    x = 1,595,854.88/1,391.06
  6. Step 6: Final answer
    x = 1,147.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.