Home / 2,115.40-3,170.83-881.88

Finding the Fourth Proportional to 2,115.40, 3,170.83 and 881.88

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Solution

The fourth proportional to 2,115.40, 3,170.83 and 881.88 is: 1,321.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.40 : 3,170.83 = 881.88 : x
  2. Step 2: Convert to fraction form
    2,115.40/3,170.83 = 881.88/x
  3. Step 3: Cross multiply
    2,115.40x = 3,170.83 × 881.88
  4. Step 4: Simplify right side
    2,115.40x = 2,796,291.56
  5. Step 5: Solve for x
    x = 2,796,291.56/2,115.40
  6. Step 6: Final answer
    x = 1,321.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.