Finding the Third Proportional to 151 and 390
Calculator
Solution
The third proportional to 151 and 390 is: 1,007.28
Step by Step Solution
- Step 1: Write the proportion equation
151 : 390 = 390 : x - Step 2: Convert to fraction form
151/390 = 390/x - Step 3: Cross multiply
151x = 390 × 390 - Step 4: Simplify right side
151x = 152,100 - Step 5: Solve for x
x = 152,100/151 - Step 6: Final answer
x = 1,007.28
Related Problems
Find third proportional to 75.50 and 195
Half scale
Find third proportional to 302 and 780
Double scale
Find third proportional to 153 and 395
Similar ratio
Find third proportional to 226.50 and 585
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (2.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.