Finding the Third Proportional to 640 and 880
Calculator
Solution
The third proportional to 640 and 880 is: 1,210
Step by Step Solution
- Step 1: Write the proportion equation
640 : 880 = 880 : x - Step 2: Convert to fraction form
640/880 = 880/x - Step 3: Cross multiply
640x = 880 × 880 - Step 4: Simplify right side
640x = 774,400 - Step 5: Solve for x
x = 774,400/640 - Step 6: Final answer
x = 1,210
Related Problems
Find third proportional to 320 and 440
Half scale
Find third proportional to 1,280 and 1,760
Double scale
Find third proportional to 642 and 883
Similar ratio
Find third proportional to 960 and 1,320
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.