Finding the Fourth Proportional to 157.21, 235.85 and 80.19
Calculator
Solution
The fourth proportional to 157.21, 235.85 and 80.19 is: 120.30
Step by Step Solution
- Step 1: Write the proportion equation
157.21 : 235.85 = 80.19 : x - Step 2: Convert to fraction form
157.21/235.85 = 80.19/x - Step 3: Cross multiply
157.21x = 235.85 × 80.19 - Step 4: Simplify right side
157.21x = 18,912.41 - Step 5: Solve for x
x = 18,912.41/157.21 - Step 6: Final answer
x = 120.30
Related Problems
Find fourth proportional to 78.60, 117.92 and 40.10
Half scale
Find fourth proportional to 314.42, 471.69 and 160.38
Double scale
Find fourth proportional to 158.21, 237.35 and 81.19
Similar ratio
Find fourth proportional to 235.81, 353.77 and 120.29
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.