Finding the Fourth Proportional to 154.15, 231.26 and 77.19
Calculator
Solution
The fourth proportional to 154.15, 231.26 and 77.19 is: 115.80
Step by Step Solution
- Step 1: Write the proportion equation
154.15 : 231.26 = 77.19 : x - Step 2: Convert to fraction form
154.15/231.26 = 77.19/x - Step 3: Cross multiply
154.15x = 231.26 × 77.19 - Step 4: Simplify right side
154.15x = 17,850.96 - Step 5: Solve for x
x = 17,850.96/154.15 - Step 6: Final answer
x = 115.80
Related Problems
Find fourth proportional to 77.08, 115.63 and 38.60
Half scale
Find fourth proportional to 308.30, 462.52 and 154.38
Double scale
Find fourth proportional to 155.15, 232.76 and 78.19
Similar ratio
Find fourth proportional to 231.23, 346.89 and 115.79
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.