Finding the Fourth Proportional to 116.78, 161.19 and 79.99
Calculator
Solution
The fourth proportional to 116.78, 161.19 and 79.99 is: 110.41
Step by Step Solution
- Step 1: Write the proportion equation
116.78 : 161.19 = 79.99 : x - Step 2: Convert to fraction form
116.78/161.19 = 79.99/x - Step 3: Cross multiply
116.78x = 161.19 × 79.99 - Step 4: Simplify right side
116.78x = 12,893.19 - Step 5: Solve for x
x = 12,893.19/116.78 - Step 6: Final answer
x = 110.41
Related Problems
Find fourth proportional to 58.39, 80.60 and 39.99
Half scale
Find fourth proportional to 233.55, 322.38 and 159.98
Double scale
Find fourth proportional to 117.78, 162.57 and 80.99
Similar ratio
Find fourth proportional to 175.16, 241.79 and 119.98
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.