Home / 3,990-9,639

Finding the Third Proportional to 3,990 and 9,639

Calculator

Solution

The third proportional to 3,990 and 9,639 is: 23,285.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990 : 9,639 = 9,639 : x
  2. Step 2: Convert to fraction form
    3,990/9,639 = 9,639/x
  3. Step 3: Cross multiply
    3,990x = 9,639 × 9,639
  4. Step 4: Simplify right side
    3,990x = 92,910,321
  5. Step 5: Solve for x
    x = 92,910,321/3,990
  6. Step 6: Final answer
    x = 23,285.79

Related Problems

Find third proportional to 1,995 and 4,819.50
Half scale
Find third proportional to 7,980 and 19,278
Double scale
Find third proportional to 3,992 and 9,644
Similar ratio
Find third proportional to 5,985 and 14,458.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.