Finding the Fourth Proportional to 135.12, 202.68 and 81
Calculator
Solution
The fourth proportional to 135.12, 202.68 and 81 is: 121.50
Step by Step Solution
- Step 1: Write the proportion equation
135.12 : 202.68 = 81 : x - Step 2: Convert to fraction form
135.12/202.68 = 81/x - Step 3: Cross multiply
135.12x = 202.68 × 81 - Step 4: Simplify right side
135.12x = 16,417.08 - Step 5: Solve for x
x = 16,417.08/135.12 - Step 6: Final answer
x = 121.50
Related Problems
Find fourth proportional to 67.56, 101.34 and 40.50
Half scale
Find fourth proportional to 270.24, 405.36 and 162
Double scale
Find fourth proportional to 136.12, 204.18 and 82
Similar ratio
Find fourth proportional to 202.68, 304.02 and 121.50
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.