Home / 7,115.80-9,819.79-3,971.99

Finding the Fourth Proportional to 7,115.80, 9,819.79 and 3,971.99

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Solution

The fourth proportional to 7,115.80, 9,819.79 and 3,971.99 is: 5,481.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,115.80 : 9,819.79 = 3,971.99 : x
  2. Step 2: Convert to fraction form
    7,115.80/9,819.79 = 3,971.99/x
  3. Step 3: Cross multiply
    7,115.80x = 9,819.79 × 3,971.99
  4. Step 4: Simplify right side
    7,115.80x = 39,004,107.68
  5. Step 5: Solve for x
    x = 39,004,107.68/7,115.80
  6. Step 6: Final answer
    x = 5,481.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.