Finding the Third Proportional to 638 and 1,347
Calculator
Solution
The third proportional to 638 and 1,347 is: 2,843.90
Step by Step Solution
- Step 1: Write the proportion equation
638 : 1,347 = 1,347 : x - Step 2: Convert to fraction form
638/1,347 = 1,347/x - Step 3: Cross multiply
638x = 1,347 × 1,347 - Step 4: Simplify right side
638x = 1,814,409 - Step 5: Solve for x
x = 1,814,409/638 - Step 6: Final answer
x = 2,843.90
Related Problems
Find third proportional to 319 and 673.50
Half scale
Find third proportional to 1,276 and 2,694
Double scale
Find third proportional to 640 and 1,351
Similar ratio
Find third proportional to 957 and 2,020.50
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.