Finding the Fourth Proportional to 78.23, 117.41 and 51.09
Calculator
Solution
The fourth proportional to 78.23, 117.41 and 51.09 is: 76.68
Step by Step Solution
- Step 1: Write the proportion equation
78.23 : 117.41 = 51.09 : x - Step 2: Convert to fraction form
78.23/117.41 = 51.09/x - Step 3: Cross multiply
78.23x = 117.41 × 51.09 - Step 4: Simplify right side
78.23x = 5,998.22 - Step 5: Solve for x
x = 5,998.22/78.23 - Step 6: Final answer
x = 76.68
Related Problems
Find fourth proportional to 39.11, 58.70 and 25.55
Half scale
Find fourth proportional to 156.45, 234.81 and 102.18
Double scale
Find fourth proportional to 79.23, 118.91 and 52.09
Similar ratio
Find fourth proportional to 117.34, 176.11 and 76.64
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.