Home / 3,800-7,980

Finding the Third Proportional to 3,800 and 7,980

Calculator

Solution

The third proportional to 3,800 and 7,980 is: 16,758

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,800 : 7,980 = 7,980 : x
  2. Step 2: Convert to fraction form
    3,800/7,980 = 7,980/x
  3. Step 3: Cross multiply
    3,800x = 7,980 × 7,980
  4. Step 4: Simplify right side
    3,800x = 63,680,400
  5. Step 5: Solve for x
    x = 63,680,400/3,800
  6. Step 6: Final answer
    x = 16,758

Related Problems

Find third proportional to 1,900 and 3,990
Half scale
Find third proportional to 7,600 and 15,960
Double scale
Find third proportional to 3,802 and 7,984
Similar ratio
Find third proportional to 5,700 and 11,970
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.