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Finding the Fourth Proportional to 3,428.96, 5,143.39 and 831.88

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Solution

The fourth proportional to 3,428.96, 5,143.39 and 831.88 is: 1,247.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,428.96 : 5,143.39 = 831.88 : x
  2. Step 2: Convert to fraction form
    3,428.96/5,143.39 = 831.88/x
  3. Step 3: Cross multiply
    3,428.96x = 5,143.39 × 831.88
  4. Step 4: Simplify right side
    3,428.96x = 4,278,683.27
  5. Step 5: Solve for x
    x = 4,278,683.27/3,428.96
  6. Step 6: Final answer
    x = 1,247.81

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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.