Home / 7,115.64-9,819.42-3,972.12

Finding the Fourth Proportional to 7,115.64, 9,819.42 and 3,972.12

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Solution

The fourth proportional to 7,115.64, 9,819.42 and 3,972.12 is: 5,481.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,115.64 : 9,819.42 = 3,972.12 : x
  2. Step 2: Convert to fraction form
    7,115.64/9,819.42 = 3,972.12/x
  3. Step 3: Cross multiply
    7,115.64x = 9,819.42 × 3,972.12
  4. Step 4: Simplify right side
    7,115.64x = 39,003,914.57
  5. Step 5: Solve for x
    x = 39,003,914.57/7,115.64
  6. Step 6: Final answer
    x = 5,481.43

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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.