Finding the Third Proportional to 309,720 and 685,768
Calculator
Solution
The third proportional to 309,720 and 685,768 is: 1,518,396.45
Step by Step Solution
- Step 1: Write the proportion equation
309,720 : 685,768 = 685,768 : x - Step 2: Convert to fraction form
309,720/685,768 = 685,768/x - Step 3: Cross multiply
309,720x = 685,768 × 685,768 - Step 4: Simplify right side
309,720x = 470,277,749,824 - Step 5: Solve for x
x = 470,277,749,824/309,720 - Step 6: Final answer
x = 1,518,396.45
Related Problems
Find third proportional to 154,860 and 342,884
Half scale
Find third proportional to 619,440 and 1,371,536
Double scale
Find third proportional to 309,722 and 685,772
Similar ratio
Find third proportional to 464,580 and 1,028,652
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (2.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.