Home / 3,926.21-5,418.14-2,157.80

Finding the Fourth Proportional to 3,926.21, 5,418.14 and 2,157.80

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Solution

The fourth proportional to 3,926.21, 5,418.14 and 2,157.80 is: 2,977.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,926.21 : 5,418.14 = 2,157.80 : x
  2. Step 2: Convert to fraction form
    3,926.21/5,418.14 = 2,157.80/x
  3. Step 3: Cross multiply
    3,926.21x = 5,418.14 × 2,157.80
  4. Step 4: Simplify right side
    3,926.21x = 11,691,224.61
  5. Step 5: Solve for x
    x = 11,691,224.61/3,926.21
  6. Step 6: Final answer
    x = 2,977.74

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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.