Finding the Third Proportional to 218 and 394
Calculator
Solution
The third proportional to 218 and 394 is: 712.09
Step by Step Solution
- Step 1: Write the proportion equation
218 : 394 = 394 : x - Step 2: Convert to fraction form
218/394 = 394/x - Step 3: Cross multiply
218x = 394 × 394 - Step 4: Simplify right side
218x = 155,236 - Step 5: Solve for x
x = 155,236/218 - Step 6: Final answer
x = 712.09
Related Problems
Find third proportional to 109 and 197
Half scale
Find third proportional to 436 and 788
Double scale
Find third proportional to 220 and 398
Similar ratio
Find third proportional to 327 and 591
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.81) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.