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Finding the Fourth Proportional to 3,139.68, 4,709.12 and 831.36

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Solution

The fourth proportional to 3,139.68, 4,709.12 and 831.36 is: 1,246.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,139.68 : 4,709.12 = 831.36 : x
  2. Step 2: Convert to fraction form
    3,139.68/4,709.12 = 831.36/x
  3. Step 3: Cross multiply
    3,139.68x = 4,709.12 × 831.36
  4. Step 4: Simplify right side
    3,139.68x = 3,914,974.00
  5. Step 5: Solve for x
    x = 3,914,974.00/3,139.68
  6. Step 6: Final answer
    x = 1,246.93

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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.