Finding the Third Proportional to 480 and 815
Calculator
Solution
The third proportional to 480 and 815 is: 1,383.80
Step by Step Solution
- Step 1: Write the proportion equation
480 : 815 = 815 : x - Step 2: Convert to fraction form
480/815 = 815/x - Step 3: Cross multiply
480x = 815 × 815 - Step 4: Simplify right side
480x = 664,225 - Step 5: Solve for x
x = 664,225/480 - Step 6: Final answer
x = 1,383.80
Related Problems
Find third proportional to 240 and 407.50
Half scale
Find third proportional to 960 and 1,630
Double scale
Find third proportional to 482 and 818
Similar ratio
Find third proportional to 720 and 1,222.50
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.70) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.