Home / 3,428.39-5,142.56-831.32

Finding the Fourth Proportional to 3,428.39, 5,142.56 and 831.32

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Solution

The fourth proportional to 3,428.39, 5,142.56 and 831.32 is: 1,246.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,428.39 : 5,142.56 = 831.32 : x
  2. Step 2: Convert to fraction form
    3,428.39/5,142.56 = 831.32/x
  3. Step 3: Cross multiply
    3,428.39x = 5,142.56 × 831.32
  4. Step 4: Simplify right side
    3,428.39x = 4,275,083.11
  5. Step 5: Solve for x
    x = 4,275,083.11/3,428.39
  6. Step 6: Final answer
    x = 1,246.97

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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.