Finding the Third Proportional to 639 and 639
Calculator
Solution
The third proportional to 639 and 639 is: 639
Step by Step Solution
- Step 1: Write the proportion equation
639 : 639 = 639 : x - Step 2: Convert to fraction form
639/639 = 639/x - Step 3: Cross multiply
639x = 639 × 639 - Step 4: Simplify right side
639x = 408,321 - Step 5: Solve for x
x = 408,321/639 - Step 6: Final answer
x = 639
Related Problems
Find third proportional to 319.50 and 319.50
Half scale
Find third proportional to 1,278 and 1,278
Double scale
Find third proportional to 641 and 641
Similar ratio
Find third proportional to 958.50 and 958.50
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.