Home / 3,138.10-4,331.28-2,143.75

Finding the Fourth Proportional to 3,138.10, 4,331.28 and 2,143.75

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Solution

The fourth proportional to 3,138.10, 4,331.28 and 2,143.75 is: 2,958.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,138.10 : 4,331.28 = 2,143.75 : x
  2. Step 2: Convert to fraction form
    3,138.10/4,331.28 = 2,143.75/x
  3. Step 3: Cross multiply
    3,138.10x = 4,331.28 × 2,143.75
  4. Step 4: Simplify right side
    3,138.10x = 9,285,181.50
  5. Step 5: Solve for x
    x = 9,285,181.50/3,138.10
  6. Step 6: Final answer
    x = 2,958.85

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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.