Finding the Third Proportional to 406.50 and 685.50
Calculator
Solution
The third proportional to 406.50 and 685.50 is: 1,155.99
Step by Step Solution
- Step 1: Write the proportion equation
406.50 : 685.50 = 685.50 : x - Step 2: Convert to fraction form
406.50/685.50 = 685.50/x - Step 3: Cross multiply
406.50x = 685.50 × 685.50 - Step 4: Simplify right side
406.50x = 469,910.25 - Step 5: Solve for x
x = 469,910.25/406.50 - Step 6: Final answer
x = 1,155.99
Related Problems
Find third proportional to 203.25 and 342.75
Half scale
Find third proportional to 813 and 1,371
Double scale
Find third proportional to 409 and 689
Similar ratio
Find third proportional to 609.75 and 1,028.25
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.69) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.