Finding the Fourth Proportional to 261.70, 392.20 and 115.23
Calculator
Solution
The fourth proportional to 261.70, 392.20 and 115.23 is: 172.69
Step by Step Solution
- Step 1: Write the proportion equation
261.70 : 392.20 = 115.23 : x - Step 2: Convert to fraction form
261.70/392.20 = 115.23/x - Step 3: Cross multiply
261.70x = 392.20 × 115.23 - Step 4: Simplify right side
261.70x = 45,192.18 - Step 5: Solve for x
x = 45,192.18/261.70 - Step 6: Final answer
x = 172.69
Related Problems
Find fourth proportional to 130.85, 196.10 and 57.61
Half scale
Find fourth proportional to 523.40, 784.40 and 230.46
Double scale
Find fourth proportional to 262.70, 393.70 and 116.23
Similar ratio
Find fourth proportional to 392.55, 588.30 and 172.84
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.