Finding the Fourth Proportional to 431.23, 647.11 and 171.19
Calculator
Solution
The fourth proportional to 431.23, 647.11 and 171.19 is: 256.88
Step by Step Solution
- Step 1: Write the proportion equation
431.23 : 647.11 = 171.19 : x - Step 2: Convert to fraction form
431.23/647.11 = 171.19/x - Step 3: Cross multiply
431.23x = 647.11 × 171.19 - Step 4: Simplify right side
431.23x = 110,775.53 - Step 5: Solve for x
x = 110,775.53/431.23 - Step 6: Final answer
x = 256.88
Related Problems
Find fourth proportional to 215.62, 323.56 and 85.59
Half scale
Find fourth proportional to 862.46, 1,294.22 and 342.37
Double scale
Find fourth proportional to 432.23, 648.61 and 172.19
Similar ratio
Find fourth proportional to 646.85, 970.67 and 256.78
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.