Finding the Fourth Proportional to 60.79, 83.87 and 40.09
Calculator
Solution
The fourth proportional to 60.79, 83.87 and 40.09 is: 55.31
Step by Step Solution
- Step 1: Write the proportion equation
60.79 : 83.87 = 40.09 : x - Step 2: Convert to fraction form
60.79/83.87 = 40.09/x - Step 3: Cross multiply
60.79x = 83.87 × 40.09 - Step 4: Simplify right side
60.79x = 3,362.15 - Step 5: Solve for x
x = 3,362.15/60.79 - Step 6: Final answer
x = 55.31
Related Problems
Find fourth proportional to 30.40, 41.93 and 20.05
Half scale
Find fourth proportional to 121.58, 167.73 and 80.18
Double scale
Find fourth proportional to 61.79, 85.24 and 41.09
Similar ratio
Find fourth proportional to 91.19, 125.80 and 60.14
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.