Finding the Fourth Proportional to 381.26, 571.69 and 121.15
Calculator
Solution
The fourth proportional to 381.26, 571.69 and 121.15 is: 181.66
Step by Step Solution
- Step 1: Write the proportion equation
381.26 : 571.69 = 121.15 : x - Step 2: Convert to fraction form
381.26/571.69 = 121.15/x - Step 3: Cross multiply
381.26x = 571.69 × 121.15 - Step 4: Simplify right side
381.26x = 69,260.24 - Step 5: Solve for x
x = 69,260.24/381.26 - Step 6: Final answer
x = 181.66
Related Problems
Find fourth proportional to 190.63, 285.85 and 60.58
Half scale
Find fourth proportional to 762.52, 1,143.38 and 242.30
Double scale
Find fourth proportional to 382.26, 573.19 and 122.15
Similar ratio
Find fourth proportional to 571.89, 857.54 and 181.73
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.