Finding the Third Proportional to 691 and 1,155
Calculator
Solution
The third proportional to 691 and 1,155 is: 1,930.57
Step by Step Solution
- Step 1: Write the proportion equation
691 : 1,155 = 1,155 : x - Step 2: Convert to fraction form
691/1,155 = 1,155/x - Step 3: Cross multiply
691x = 1,155 × 1,155 - Step 4: Simplify right side
691x = 1,334,025 - Step 5: Solve for x
x = 1,334,025/691 - Step 6: Final answer
x = 1,930.57
Related Problems
Find third proportional to 345.50 and 577.50
Half scale
Find third proportional to 1,382 and 2,310
Double scale
Find third proportional to 693 and 1,158
Similar ratio
Find third proportional to 1,036.50 and 1,732.50
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.67) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.