Finding the Fourth Proportional to 49.98, 74.99 and 21.09
Calculator
Solution
The fourth proportional to 49.98, 74.99 and 21.09 is: 31.65
Step by Step Solution
- Step 1: Write the proportion equation
49.98 : 74.99 = 21.09 : x - Step 2: Convert to fraction form
49.98/74.99 = 21.09/x - Step 3: Cross multiply
49.98x = 74.99 × 21.09 - Step 4: Simplify right side
49.98x = 1,581.74 - Step 5: Solve for x
x = 1,581.74/49.98 - Step 6: Final answer
x = 31.65
Related Problems
Find fourth proportional to 24.99, 37.49 and 10.55
Half scale
Find fourth proportional to 99.95, 149.97 and 42.19
Double scale
Find fourth proportional to 50.98, 76.49 and 22.09
Similar ratio
Find fourth proportional to 74.96, 112.48 and 31.64
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.