Home / 128,878-189,078

Finding the Third Proportional to 128,878 and 189,078

Calculator

Solution

The third proportional to 128,878 and 189,078 is: 277,397.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,878 : 189,078 = 189,078 : x
  2. Step 2: Convert to fraction form
    128,878/189,078 = 189,078/x
  3. Step 3: Cross multiply
    128,878x = 189,078 × 189,078
  4. Step 4: Simplify right side
    128,878x = 35,750,490,084
  5. Step 5: Solve for x
    x = 35,750,490,084/128,878
  6. Step 6: Final answer
    x = 277,397.93

Related Problems

Find third proportional to 64,439 and 94,539
Half scale
Find third proportional to 257,756 and 378,156
Double scale
Find third proportional to 128,880 and 189,081
Similar ratio
Find third proportional to 193,317 and 283,617
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.