Finding the Fourth Proportional to 88.21, 121.64 and 63.75
Calculator
Solution
The fourth proportional to 88.21, 121.64 and 63.75 is: 87.92
Step by Step Solution
- Step 1: Write the proportion equation
88.21 : 121.64 = 63.75 : x - Step 2: Convert to fraction form
88.21/121.64 = 63.75/x - Step 3: Cross multiply
88.21x = 121.64 × 63.75 - Step 4: Simplify right side
88.21x = 7,754.69 - Step 5: Solve for x
x = 7,754.69/88.21 - Step 6: Final answer
x = 87.92
Related Problems
Find fourth proportional to 44.10, 60.82 and 31.88
Half scale
Find fourth proportional to 176.41, 243.27 and 127.51
Double scale
Find fourth proportional to 89.21, 123.01 and 64.75
Similar ratio
Find fourth proportional to 132.31, 182.45 and 95.63
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.