Home / 3,139.03-4,331.90-1,960.78

Finding the Fourth Proportional to 3,139.03, 4,331.90 and 1,960.78

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Solution

The fourth proportional to 3,139.03, 4,331.90 and 1,960.78 is: 2,705.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,139.03 : 4,331.90 = 1,960.78 : x
  2. Step 2: Convert to fraction form
    3,139.03/4,331.90 = 1,960.78/x
  3. Step 3: Cross multiply
    3,139.03x = 4,331.90 × 1,960.78
  4. Step 4: Simplify right side
    3,139.03x = 8,493,902.88
  5. Step 5: Solve for x
    x = 8,493,902.88/3,139.03
  6. Step 6: Final answer
    x = 2,705.90

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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.