Finding the Fourth Proportional to 170.91, 235.78 and 115.70
Calculator
Solution
The fourth proportional to 170.91, 235.78 and 115.70 is: 159.61
Step by Step Solution
- Step 1: Write the proportion equation
170.91 : 235.78 = 115.70 : x - Step 2: Convert to fraction form
170.91/235.78 = 115.70/x - Step 3: Cross multiply
170.91x = 235.78 × 115.70 - Step 4: Simplify right side
170.91x = 27,278.28 - Step 5: Solve for x
x = 27,278.28/170.91 - Step 6: Final answer
x = 159.61
Related Problems
Find fourth proportional to 85.46, 117.89 and 57.85
Half scale
Find fourth proportional to 341.82, 471.56 and 231.39
Double scale
Find fourth proportional to 171.91, 237.16 and 116.70
Similar ratio
Find fourth proportional to 256.37, 353.67 and 173.54
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.