Home / 7,115.68-9,819.84-3,971.80

Finding the Fourth Proportional to 7,115.68, 9,819.84 and 3,971.80

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Solution

The fourth proportional to 7,115.68, 9,819.84 and 3,971.80 is: 5,481.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,115.68 : 9,819.84 = 3,971.80 : x
  2. Step 2: Convert to fraction form
    7,115.68/9,819.84 = 3,971.80/x
  3. Step 3: Cross multiply
    7,115.68x = 9,819.84 × 3,971.80
  4. Step 4: Simplify right side
    7,115.68x = 39,002,440.51
  5. Step 5: Solve for x
    x = 39,002,440.51/7,115.68
  6. Step 6: Final answer
    x = 5,481.20

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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.