Finding the Third Proportional to 643,990 and 1,398,599
Calculator
Solution
The third proportional to 643,990 and 1,398,599 is: 3,037,437.17
Step by Step Solution
- Step 1: Write the proportion equation
643,990 : 1,398,599 = 1,398,599 : x - Step 2: Convert to fraction form
643,990/1,398,599 = 1,398,599/x - Step 3: Cross multiply
643,990x = 1,398,599 × 1,398,599 - Step 4: Simplify right side
643,990x = 1,956,079,162,801 - Step 5: Solve for x
x = 1,956,079,162,801/643,990 - Step 6: Final answer
x = 3,037,437.17
Related Problems
Find third proportional to 321,995 and 699,299.50
Half scale
Find third proportional to 1,287,980 and 2,797,198
Double scale
Find third proportional to 643,992 and 1,398,603
Similar ratio
Find third proportional to 965,985 and 2,097,898.50
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.