Finding the Fourth Proportional to 120.16, 165.56 and 81.28
Calculator
Solution
The fourth proportional to 120.16, 165.56 and 81.28 is: 111.99
Step by Step Solution
- Step 1: Write the proportion equation
120.16 : 165.56 = 81.28 : x - Step 2: Convert to fraction form
120.16/165.56 = 81.28/x - Step 3: Cross multiply
120.16x = 165.56 × 81.28 - Step 4: Simplify right side
120.16x = 13,456.72 - Step 5: Solve for x
x = 13,456.72/120.16 - Step 6: Final answer
x = 111.99
Related Problems
Find fourth proportional to 60.08, 82.78 and 40.64
Half scale
Find fourth proportional to 240.32, 331.12 and 162.56
Double scale
Find fourth proportional to 121.16, 166.94 and 82.28
Similar ratio
Find fourth proportional to 180.24, 248.34 and 121.92
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.