Finding the Fourth Proportional to 69.21, 95.50 and 42.99
Calculator
Solution
The fourth proportional to 69.21, 95.50 and 42.99 is: 59.32
Step by Step Solution
- Step 1: Write the proportion equation
69.21 : 95.50 = 42.99 : x - Step 2: Convert to fraction form
69.21/95.50 = 42.99/x - Step 3: Cross multiply
69.21x = 95.50 × 42.99 - Step 4: Simplify right side
69.21x = 4,105.55 - Step 5: Solve for x
x = 4,105.55/69.21 - Step 6: Final answer
x = 59.32
Related Problems
Find fourth proportional to 34.61, 47.75 and 21.50
Half scale
Find fourth proportional to 138.42, 191 and 85.98
Double scale
Find fourth proportional to 70.21, 96.88 and 43.99
Similar ratio
Find fourth proportional to 103.82, 143.25 and 64.49
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.