Home / 275,256-420,780

Finding the Third Proportional to 275,256 and 420,780

Calculator

Solution

The third proportional to 275,256 and 420,780 is: 643,240.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    275,256 : 420,780 = 420,780 : x
  2. Step 2: Convert to fraction form
    275,256/420,780 = 420,780/x
  3. Step 3: Cross multiply
    275,256x = 420,780 × 420,780
  4. Step 4: Simplify right side
    275,256x = 177,055,808,400
  5. Step 5: Solve for x
    x = 177,055,808,400/275,256
  6. Step 6: Final answer
    x = 643,240.50

Related Problems

Find third proportional to 137,628 and 210,390
Half scale
Find third proportional to 550,512 and 841,560
Double scale
Find third proportional to 275,258 and 420,783
Similar ratio
Find third proportional to 412,884 and 631,170
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.