Finding the Fourth Proportional to 120.58, 180.58 and 74.78
Calculator
Solution
The fourth proportional to 120.58, 180.58 and 74.78 is: 111.99
Step by Step Solution
- Step 1: Write the proportion equation
120.58 : 180.58 = 74.78 : x - Step 2: Convert to fraction form
120.58/180.58 = 74.78/x - Step 3: Cross multiply
120.58x = 180.58 × 74.78 - Step 4: Simplify right side
120.58x = 13,503.77 - Step 5: Solve for x
x = 13,503.77/120.58 - Step 6: Final answer
x = 111.99
Related Problems
Find fourth proportional to 60.29, 90.29 and 37.39
Half scale
Find fourth proportional to 241.16, 361.16 and 149.56
Double scale
Find fourth proportional to 121.58, 182.08 and 75.78
Similar ratio
Find fourth proportional to 180.87, 270.87 and 112.17
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.