Home / 12,390-18,981

Finding the Third Proportional to 12,390 and 18,981

Calculator

Solution

The third proportional to 12,390 and 18,981 is: 29,078.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,390 : 18,981 = 18,981 : x
  2. Step 2: Convert to fraction form
    12,390/18,981 = 18,981/x
  3. Step 3: Cross multiply
    12,390x = 18,981 × 18,981
  4. Step 4: Simplify right side
    12,390x = 360,278,361
  5. Step 5: Solve for x
    x = 360,278,361/12,390
  6. Step 6: Final answer
    x = 29,078.16

Related Problems

Find third proportional to 6,195 and 9,490.50
Half scale
Find third proportional to 24,780 and 37,962
Double scale
Find third proportional to 12,392 and 18,984
Similar ratio
Find third proportional to 18,585 and 28,471.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.