Finding the Fourth Proportional to 76.74, 115.11 and 18.96
Calculator
Solution
The fourth proportional to 76.74, 115.11 and 18.96 is: 28.45
Step by Step Solution
- Step 1: Write the proportion equation
76.74 : 115.11 = 18.96 : x - Step 2: Convert to fraction form
76.74/115.11 = 18.96/x - Step 3: Cross multiply
76.74x = 115.11 × 18.96 - Step 4: Simplify right side
76.74x = 2,182.99 - Step 5: Solve for x
x = 2,182.99/76.74 - Step 6: Final answer
x = 28.45
Related Problems
Find fourth proportional to 38.37, 57.56 and 9.48
Half scale
Find fourth proportional to 153.49, 230.23 and 37.93
Double scale
Find fourth proportional to 77.74, 116.61 and 19.96
Similar ratio
Find fourth proportional to 115.12, 172.67 and 28.45
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.