Finding the Third Proportional to 219 and 391
Calculator
Solution
The third proportional to 219 and 391 is: 698.09
Step by Step Solution
- Step 1: Write the proportion equation
219 : 391 = 391 : x - Step 2: Convert to fraction form
219/391 = 391/x - Step 3: Cross multiply
219x = 391 × 391 - Step 4: Simplify right side
219x = 152,881 - Step 5: Solve for x
x = 152,881/219 - Step 6: Final answer
x = 698.09
Related Problems
Find third proportional to 109.50 and 195.50
Half scale
Find third proportional to 438 and 782
Double scale
Find third proportional to 221 and 395
Similar ratio
Find third proportional to 328.50 and 586.50
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.79) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.