Finding the Fourth Proportional to 99.86, 149.80 and 38.99
Calculator
Solution
The fourth proportional to 99.86, 149.80 and 38.99 is: 58.48
Step by Step Solution
- Step 1: Write the proportion equation
99.86 : 149.80 = 38.99 : x - Step 2: Convert to fraction form
99.86/149.80 = 38.99/x - Step 3: Cross multiply
99.86x = 149.80 × 38.99 - Step 4: Simplify right side
99.86x = 5,839.86 - Step 5: Solve for x
x = 5,839.86/99.86 - Step 6: Final answer
x = 58.48
Related Problems
Find fourth proportional to 49.93, 74.90 and 19.49
Half scale
Find fourth proportional to 199.73, 299.60 and 77.97
Double scale
Find fourth proportional to 100.86, 151.30 and 39.99
Similar ratio
Find fourth proportional to 149.79, 224.70 and 58.48
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.