Home / 81,718-128,407

Finding the Third Proportional to 81,718 and 128,407

Calculator

Solution

The third proportional to 81,718 and 128,407 is: 201,771.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,718 : 128,407 = 128,407 : x
  2. Step 2: Convert to fraction form
    81,718/128,407 = 128,407/x
  3. Step 3: Cross multiply
    81,718x = 128,407 × 128,407
  4. Step 4: Simplify right side
    81,718x = 16,488,357,649
  5. Step 5: Solve for x
    x = 16,488,357,649/81,718
  6. Step 6: Final answer
    x = 201,771.43

Related Problems

Find third proportional to 40,859 and 64,203.50
Half scale
Find third proportional to 163,436 and 256,814
Double scale
Find third proportional to 81,720 and 128,410
Similar ratio
Find third proportional to 122,577 and 192,610.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.