Finding the Fourth Proportional to 209.79, 315.36 and 198.99
Calculator
Solution
The fourth proportional to 209.79, 315.36 and 198.99 is: 299.13
Step by Step Solution
- Step 1: Write the proportion equation
209.79 : 315.36 = 198.99 : x - Step 2: Convert to fraction form
209.79/315.36 = 198.99/x - Step 3: Cross multiply
209.79x = 315.36 × 198.99 - Step 4: Simplify right side
209.79x = 62,753.49 - Step 5: Solve for x
x = 62,753.49/209.79 - Step 6: Final answer
x = 299.13
Related Problems
Find fourth proportional to 104.90, 157.68 and 99.50
Half scale
Find fourth proportional to 419.58, 630.72 and 397.98
Double scale
Find fourth proportional to 210.79, 316.86 and 199.99
Similar ratio
Find fourth proportional to 314.69, 473.04 and 298.49
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.