Finding the Third Proportional to 490 and 648
Calculator
Solution
The third proportional to 490 and 648 is: 856.95
Step by Step Solution
- Step 1: Write the proportion equation
490 : 648 = 648 : x - Step 2: Convert to fraction form
490/648 = 648/x - Step 3: Cross multiply
490x = 648 × 648 - Step 4: Simplify right side
490x = 419,904 - Step 5: Solve for x
x = 419,904/490 - Step 6: Final answer
x = 856.95
Related Problems
Find third proportional to 245 and 324
Half scale
Find third proportional to 980 and 1,296
Double scale
Find third proportional to 492 and 651
Similar ratio
Find third proportional to 735 and 972
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.