Finding the Fourth Proportional to 71.34, 98.64 and 54.96
Calculator
Solution
The fourth proportional to 71.34, 98.64 and 54.96 is: 75.99
Step by Step Solution
- Step 1: Write the proportion equation
71.34 : 98.64 = 54.96 : x - Step 2: Convert to fraction form
71.34/98.64 = 54.96/x - Step 3: Cross multiply
71.34x = 98.64 × 54.96 - Step 4: Simplify right side
71.34x = 5,421.25 - Step 5: Solve for x
x = 5,421.25/71.34 - Step 6: Final answer
x = 75.99
Related Problems
Find fourth proportional to 35.67, 49.32 and 27.48
Half scale
Find fourth proportional to 142.68, 197.28 and 109.92
Double scale
Find fourth proportional to 72.34, 100.02 and 55.96
Similar ratio
Find fourth proportional to 107.01, 147.96 and 82.44
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.