Home / 3,921.82-5,412.20-2,153.44

Finding the Fourth Proportional to 3,921.82, 5,412.20 and 2,153.44

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Solution

The fourth proportional to 3,921.82, 5,412.20 and 2,153.44 is: 2,971.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,921.82 : 5,412.20 = 2,153.44 : x
  2. Step 2: Convert to fraction form
    3,921.82/5,412.20 = 2,153.44/x
  3. Step 3: Cross multiply
    3,921.82x = 5,412.20 × 2,153.44
  4. Step 4: Simplify right side
    3,921.82x = 11,654,847.97
  5. Step 5: Solve for x
    x = 11,654,847.97/3,921.82
  6. Step 6: Final answer
    x = 2,971.80

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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.