Home / 7,115.81-9,819.80-3,971.99

Finding the Fourth Proportional to 7,115.81, 9,819.80 and 3,971.99

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Solution

The fourth proportional to 7,115.81, 9,819.80 and 3,971.99 is: 5,481.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,115.81 : 9,819.80 = 3,971.99 : x
  2. Step 2: Convert to fraction form
    7,115.81/9,819.80 = 3,971.99/x
  3. Step 3: Cross multiply
    7,115.81x = 9,819.80 × 3,971.99
  4. Step 4: Simplify right side
    7,115.81x = 39,004,078.44
  5. Step 5: Solve for x
    x = 39,004,078.44/7,115.81
  6. Step 6: Final answer
    x = 5,481.33

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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.