Home / 9,995-19,990

Finding the Third Proportional to 9,995 and 19,990

Calculator

Solution

The third proportional to 9,995 and 19,990 is: 39,980

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,995 : 19,990 = 19,990 : x
  2. Step 2: Convert to fraction form
    9,995/19,990 = 19,990/x
  3. Step 3: Cross multiply
    9,995x = 19,990 × 19,990
  4. Step 4: Simplify right side
    9,995x = 399,600,100
  5. Step 5: Solve for x
    x = 399,600,100/9,995
  6. Step 6: Final answer
    x = 39,980

Related Problems

Find third proportional to 4,997.50 and 9,995
Half scale
Find third proportional to 19,990 and 39,980
Double scale
Find third proportional to 9,997 and 19,994
Similar ratio
Find third proportional to 14,992.50 and 29,985
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.