Home / 6,399-12,987

Finding the Third Proportional to 6,399 and 12,987

Calculator

Solution

The third proportional to 6,399 and 12,987 is: 26,357.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,399 : 12,987 = 12,987 : x
  2. Step 2: Convert to fraction form
    6,399/12,987 = 12,987/x
  3. Step 3: Cross multiply
    6,399x = 12,987 × 12,987
  4. Step 4: Simplify right side
    6,399x = 168,662,169
  5. Step 5: Solve for x
    x = 168,662,169/6,399
  6. Step 6: Final answer
    x = 26,357.58

Related Problems

Find third proportional to 3,199.50 and 6,493.50
Half scale
Find third proportional to 12,798 and 25,974
Double scale
Find third proportional to 6,401 and 12,991
Similar ratio
Find third proportional to 9,598.50 and 19,480.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.03) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.