Home / 7,115.88-9,819.92-3,972.07

Finding the Fourth Proportional to 7,115.88, 9,819.92 and 3,972.07

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Solution

The fourth proportional to 7,115.88, 9,819.92 and 3,972.07 is: 5,481.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,115.88 : 9,819.92 = 3,972.07 : x
  2. Step 2: Convert to fraction form
    7,115.88/9,819.92 = 3,972.07/x
  3. Step 3: Cross multiply
    7,115.88x = 9,819.92 × 3,972.07
  4. Step 4: Simplify right side
    7,115.88x = 39,005,439.29
  5. Step 5: Solve for x
    x = 39,005,439.29/7,115.88
  6. Step 6: Final answer
    x = 5,481.46

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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.