Home / 3,910.95-5,396.90-2,142.20

Finding the Fourth Proportional to 3,910.95, 5,396.90 and 2,142.20

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Solution

The fourth proportional to 3,910.95, 5,396.90 and 2,142.20 is: 2,956.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,910.95 : 5,396.90 = 2,142.20 : x
  2. Step 2: Convert to fraction form
    3,910.95/5,396.90 = 2,142.20/x
  3. Step 3: Cross multiply
    3,910.95x = 5,396.90 × 2,142.20
  4. Step 4: Simplify right side
    3,910.95x = 11,561,241.96
  5. Step 5: Solve for x
    x = 11,561,241.96/3,910.95
  6. Step 6: Final answer
    x = 2,956.12

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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.