Finding the Fourth Proportional to 108.87, 163.05 and 85.99
Calculator
Solution
The fourth proportional to 108.87, 163.05 and 85.99 is: 128.78
Step by Step Solution
- Step 1: Write the proportion equation
108.87 : 163.05 = 85.99 : x - Step 2: Convert to fraction form
108.87/163.05 = 85.99/x - Step 3: Cross multiply
108.87x = 163.05 × 85.99 - Step 4: Simplify right side
108.87x = 14,020.67 - Step 5: Solve for x
x = 14,020.67/108.87 - Step 6: Final answer
x = 128.78
Related Problems
Find fourth proportional to 54.44, 81.53 and 43.00
Half scale
Find fourth proportional to 217.74, 326.10 and 171.98
Double scale
Find fourth proportional to 109.87, 164.55 and 86.99
Similar ratio
Find fourth proportional to 163.31, 244.58 and 128.99
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.