Home / 128,760-206,820

Finding the Third Proportional to 128,760 and 206,820

Calculator

Solution

The third proportional to 128,760 and 206,820 is: 332,203.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,760 : 206,820 = 206,820 : x
  2. Step 2: Convert to fraction form
    128,760/206,820 = 206,820/x
  3. Step 3: Cross multiply
    128,760x = 206,820 × 206,820
  4. Step 4: Simplify right side
    128,760x = 42,774,512,400
  5. Step 5: Solve for x
    x = 42,774,512,400/128,760
  6. Step 6: Final answer
    x = 332,203.42

Related Problems

Find third proportional to 64,380 and 103,410
Half scale
Find third proportional to 257,520 and 413,640
Double scale
Find third proportional to 128,762 and 206,823
Similar ratio
Find third proportional to 193,140 and 310,230
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.