Home / 3,979-7,858

Finding the Third Proportional to 3,979 and 7,858

Calculator

Solution

The third proportional to 3,979 and 7,858 is: 15,518.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,979 : 7,858 = 7,858 : x
  2. Step 2: Convert to fraction form
    3,979/7,858 = 7,858/x
  3. Step 3: Cross multiply
    3,979x = 7,858 × 7,858
  4. Step 4: Simplify right side
    3,979x = 61,748,164
  5. Step 5: Solve for x
    x = 61,748,164/3,979
  6. Step 6: Final answer
    x = 15,518.51

Related Problems

Find third proportional to 1,989.50 and 3,929
Half scale
Find third proportional to 7,958 and 15,716
Double scale
Find third proportional to 3,981 and 7,862
Similar ratio
Find third proportional to 5,968.50 and 11,787
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.97) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.