Home / 428,660-905,920

Finding the Third Proportional to 428,660 and 905,920

Calculator

Solution

The third proportional to 428,660 and 905,920 is: 1,914,550.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,660 : 905,920 = 905,920 : x
  2. Step 2: Convert to fraction form
    428,660/905,920 = 905,920/x
  3. Step 3: Cross multiply
    428,660x = 905,920 × 905,920
  4. Step 4: Simplify right side
    428,660x = 820,691,046,400
  5. Step 5: Solve for x
    x = 820,691,046,400/428,660
  6. Step 6: Final answer
    x = 1,914,550.10

Related Problems

Find third proportional to 214,330 and 452,960
Half scale
Find third proportional to 857,320 and 1,811,840
Double scale
Find third proportional to 428,662 and 905,924
Similar ratio
Find third proportional to 642,990 and 1,358,880
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.