Home / 3,100.78-4,280.34-2,157.94

Finding the Fourth Proportional to 3,100.78, 4,280.34 and 2,157.94

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Solution

The fourth proportional to 3,100.78, 4,280.34 and 2,157.94 is: 2,978.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,100.78 : 4,280.34 = 2,157.94 : x
  2. Step 2: Convert to fraction form
    3,100.78/4,280.34 = 2,157.94/x
  3. Step 3: Cross multiply
    3,100.78x = 4,280.34 × 2,157.94
  4. Step 4: Simplify right side
    3,100.78x = 9,236,716.90
  5. Step 5: Solve for x
    x = 9,236,716.90/3,100.78
  6. Step 6: Final answer
    x = 2,978.84

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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.