Finding the Third Proportional to 67 and 85.75
Calculator
Solution
The third proportional to 67 and 85.75 is: 109.75
Step by Step Solution
- Step 1: Write the proportion equation
67 : 85.75 = 85.75 : x - Step 2: Convert to fraction form
67/85.75 = 85.75/x - Step 3: Cross multiply
67x = 85.75 × 85.75 - Step 4: Simplify right side
67x = 7,353.06 - Step 5: Solve for x
x = 7,353.06/67 - Step 6: Final answer
x = 109.75
Related Problems
Find third proportional to 33.50 and 42.88
Half scale
Find third proportional to 134 and 171.50
Double scale
Find third proportional to 69 and 88
Similar ratio
Find third proportional to 100.50 and 128.63
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.