Finding the Fourth Proportional to 121.70, 182.21 and 112.13
Calculator
Solution
The fourth proportional to 121.70, 182.21 and 112.13 is: 167.88
Step by Step Solution
- Step 1: Write the proportion equation
121.70 : 182.21 = 112.13 : x - Step 2: Convert to fraction form
121.70/182.21 = 112.13/x - Step 3: Cross multiply
121.70x = 182.21 × 112.13 - Step 4: Simplify right side
121.70x = 20,431.31 - Step 5: Solve for x
x = 20,431.31/121.70 - Step 6: Final answer
x = 167.88
Related Problems
Find fourth proportional to 60.85, 91.10 and 56.07
Half scale
Find fourth proportional to 243.40, 364.41 and 224.27
Double scale
Find fourth proportional to 122.70, 183.70 and 113.13
Similar ratio
Find fourth proportional to 182.55, 273.31 and 168.20
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.