Finding the Fourth Proportional to 209.26, 313.91 and 81.02
Calculator
Solution
The fourth proportional to 209.26, 313.91 and 81.02 is: 121.54
Step by Step Solution
- Step 1: Write the proportion equation
209.26 : 313.91 = 81.02 : x - Step 2: Convert to fraction form
209.26/313.91 = 81.02/x - Step 3: Cross multiply
209.26x = 313.91 × 81.02 - Step 4: Simplify right side
209.26x = 25,432.99 - Step 5: Solve for x
x = 25,432.99/209.26 - Step 6: Final answer
x = 121.54
Related Problems
Find fourth proportional to 104.63, 156.96 and 40.51
Half scale
Find fourth proportional to 418.52, 627.82 and 162.04
Double scale
Find fourth proportional to 210.26, 315.41 and 82.02
Similar ratio
Find fourth proportional to 313.89, 470.87 and 121.53
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.