Finding the Fourth Proportional to 122.58, 169.11 and 87.66
Calculator
Solution
The fourth proportional to 122.58, 169.11 and 87.66 is: 120.93
Step by Step Solution
- Step 1: Write the proportion equation
122.58 : 169.11 = 87.66 : x - Step 2: Convert to fraction form
122.58/169.11 = 87.66/x - Step 3: Cross multiply
122.58x = 169.11 × 87.66 - Step 4: Simplify right side
122.58x = 14,824.18 - Step 5: Solve for x
x = 14,824.18/122.58 - Step 6: Final answer
x = 120.93
Related Problems
Find fourth proportional to 61.29, 84.56 and 43.83
Half scale
Find fourth proportional to 245.16, 338.22 and 175.32
Double scale
Find fourth proportional to 123.58, 170.49 and 88.66
Similar ratio
Find fourth proportional to 183.87, 253.67 and 131.49
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.