Finding the Fourth Proportional to 81.26, 121.66 and 74.88
Calculator
Solution
The fourth proportional to 81.26, 121.66 and 74.88 is: 112.11
Step by Step Solution
- Step 1: Write the proportion equation
81.26 : 121.66 = 74.88 : x - Step 2: Convert to fraction form
81.26/121.66 = 74.88/x - Step 3: Cross multiply
81.26x = 121.66 × 74.88 - Step 4: Simplify right side
81.26x = 9,109.71 - Step 5: Solve for x
x = 9,109.71/81.26 - Step 6: Final answer
x = 112.11
Related Problems
Find fourth proportional to 40.63, 60.83 and 37.44
Half scale
Find fourth proportional to 162.52, 243.32 and 149.76
Double scale
Find fourth proportional to 82.26, 123.15 and 75.88
Similar ratio
Find fourth proportional to 121.89, 182.49 and 112.32
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.