Home / 3,428.35-5,142.51-831.31

Finding the Fourth Proportional to 3,428.35, 5,142.51 and 831.31

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Solution

The fourth proportional to 3,428.35, 5,142.51 and 831.31 is: 1,246.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,428.35 : 5,142.51 = 831.31 : x
  2. Step 2: Convert to fraction form
    3,428.35/5,142.51 = 831.31/x
  3. Step 3: Cross multiply
    3,428.35x = 5,142.51 × 831.31
  4. Step 4: Simplify right side
    3,428.35x = 4,275,019.99
  5. Step 5: Solve for x
    x = 4,275,019.99/3,428.35
  6. Step 6: Final answer
    x = 1,246.96

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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.