Finding the Third Proportional to 145 and 316.50
Calculator
Solution
The third proportional to 145 and 316.50 is: 690.84
Step by Step Solution
- Step 1: Write the proportion equation
145 : 316.50 = 316.50 : x - Step 2: Convert to fraction form
145/316.50 = 316.50/x - Step 3: Cross multiply
145x = 316.50 × 316.50 - Step 4: Simplify right side
145x = 100,172.25 - Step 5: Solve for x
x = 100,172.25/145 - Step 6: Final answer
x = 690.84
Related Problems
Find third proportional to 72.50 and 158.25
Half scale
Find third proportional to 290 and 633
Double scale
Find third proportional to 147 and 321
Similar ratio
Find third proportional to 217.50 and 474.75
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.