Finding the Fourth Proportional to 387.75, 581.69 and 131.31
Calculator
Solution
The fourth proportional to 387.75, 581.69 and 131.31 is: 196.99
Step by Step Solution
- Step 1: Write the proportion equation
387.75 : 581.69 = 131.31 : x - Step 2: Convert to fraction form
387.75/581.69 = 131.31/x - Step 3: Cross multiply
387.75x = 581.69 × 131.31 - Step 4: Simplify right side
387.75x = 76,381.06 - Step 5: Solve for x
x = 76,381.06/387.75 - Step 6: Final answer
x = 196.99
Related Problems
Find fourth proportional to 193.88, 290.84 and 65.66
Half scale
Find fourth proportional to 775.50, 1,163.37 and 262.62
Double scale
Find fourth proportional to 388.75, 583.19 and 132.31
Similar ratio
Find fourth proportional to 581.63, 872.53 and 196.97
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.