Finding the Third Proportional to 139.50 and 240
Calculator
Solution
The third proportional to 139.50 and 240 is: 412.90
Step by Step Solution
- Step 1: Write the proportion equation
139.50 : 240 = 240 : x - Step 2: Convert to fraction form
139.50/240 = 240/x - Step 3: Cross multiply
139.50x = 240 × 240 - Step 4: Simplify right side
139.50x = 57,600 - Step 5: Solve for x
x = 57,600/139.50 - Step 6: Final answer
x = 412.90
Related Problems
Find third proportional to 69.75 and 120
Half scale
Find third proportional to 279 and 480
Double scale
Find third proportional to 142 and 243
Similar ratio
Find third proportional to 209.25 and 360
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.72) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.