Finding the Fourth Proportional to 386.09, 578.99 and 191.08
Calculator
Solution
The fourth proportional to 386.09, 578.99 and 191.08 is: 286.55
Step by Step Solution
- Step 1: Write the proportion equation
386.09 : 578.99 = 191.08 : x - Step 2: Convert to fraction form
386.09/578.99 = 191.08/x - Step 3: Cross multiply
386.09x = 578.99 × 191.08 - Step 4: Simplify right side
386.09x = 110,632.44 - Step 5: Solve for x
x = 110,632.44/386.09 - Step 6: Final answer
x = 286.55
Related Problems
Find fourth proportional to 193.04, 289.50 and 95.54
Half scale
Find fourth proportional to 772.17, 1,157.99 and 382.16
Double scale
Find fourth proportional to 387.09, 580.49 and 192.08
Similar ratio
Find fourth proportional to 579.13, 868.49 and 286.62
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.