Finding the Fourth Proportional to 102.36, 141.09 and 71.31
Calculator
Solution
The fourth proportional to 102.36, 141.09 and 71.31 is: 98.29
Step by Step Solution
- Step 1: Write the proportion equation
102.36 : 141.09 = 71.31 : x - Step 2: Convert to fraction form
102.36/141.09 = 71.31/x - Step 3: Cross multiply
102.36x = 141.09 × 71.31 - Step 4: Simplify right side
102.36x = 10,061.13 - Step 5: Solve for x
x = 10,061.13/102.36 - Step 6: Final answer
x = 98.29
Related Problems
Find fourth proportional to 51.18, 70.55 and 35.66
Half scale
Find fourth proportional to 204.72, 282.18 and 142.62
Double scale
Find fourth proportional to 103.36, 142.47 and 72.31
Similar ratio
Find fourth proportional to 153.54, 211.64 and 106.97
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.