Home / 3,000-3,900

Finding the Third Proportional to 3,000 and 3,900

Calculator

Solution

The third proportional to 3,000 and 3,900 is: 5,070

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,000 : 3,900 = 3,900 : x
  2. Step 2: Convert to fraction form
    3,000/3,900 = 3,900/x
  3. Step 3: Cross multiply
    3,000x = 3,900 × 3,900
  4. Step 4: Simplify right side
    3,000x = 15,210,000
  5. Step 5: Solve for x
    x = 15,210,000/3,000
  6. Step 6: Final answer
    x = 5,070

Related Problems

Find third proportional to 1,500 and 1,950
Half scale
Find third proportional to 6,000 and 7,800
Double scale
Find third proportional to 3,002 and 3,903
Similar ratio
Find third proportional to 4,500 and 5,850
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.