Finding the Fourth Proportional to 122.80, 169.36 and 84
Calculator
Solution
The fourth proportional to 122.80, 169.36 and 84 is: 115.85
Step by Step Solution
- Step 1: Write the proportion equation
122.80 : 169.36 = 84 : x - Step 2: Convert to fraction form
122.80/169.36 = 84/x - Step 3: Cross multiply
122.80x = 169.36 × 84 - Step 4: Simplify right side
122.80x = 14,226.24 - Step 5: Solve for x
x = 14,226.24/122.80 - Step 6: Final answer
x = 115.85
Related Problems
Find fourth proportional to 61.40, 84.68 and 42
Half scale
Find fourth proportional to 245.60, 338.72 and 168
Double scale
Find fourth proportional to 123.80, 170.74 and 85
Similar ratio
Find fourth proportional to 184.20, 254.04 and 126
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.