Home / 7,982.80-11,974.80-2,139.28

Finding the Fourth Proportional to 7,982.80, 11,974.80 and 2,139.28

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Solution

The fourth proportional to 7,982.80, 11,974.80 and 2,139.28 is: 3,209.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,982.80 : 11,974.80 = 2,139.28 : x
  2. Step 2: Convert to fraction form
    7,982.80/11,974.80 = 2,139.28/x
  3. Step 3: Cross multiply
    7,982.80x = 11,974.80 × 2,139.28
  4. Step 4: Simplify right side
    7,982.80x = 25,617,450.14
  5. Step 5: Solve for x
    x = 25,617,450.14/7,982.80
  6. Step 6: Final answer
    x = 3,209.08

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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.