Finding the Fourth Proportional to 138.26, 207.18 and 83.99
Calculator
Solution
The fourth proportional to 138.26, 207.18 and 83.99 is: 125.85
Step by Step Solution
- Step 1: Write the proportion equation
138.26 : 207.18 = 83.99 : x - Step 2: Convert to fraction form
138.26/207.18 = 83.99/x - Step 3: Cross multiply
138.26x = 207.18 × 83.99 - Step 4: Simplify right side
138.26x = 17,400.01 - Step 5: Solve for x
x = 17,400.01/138.26 - Step 6: Final answer
x = 125.85
Related Problems
Find fourth proportional to 69.13, 103.59 and 41.99
Half scale
Find fourth proportional to 276.51, 414.36 and 167.97
Double scale
Find fourth proportional to 139.26, 208.68 and 84.99
Similar ratio
Find fourth proportional to 207.38, 310.77 and 125.98
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.