Finding the Fourth Proportional to 400.24, 600.40 and 207.76
Calculator
Solution
The fourth proportional to 400.24, 600.40 and 207.76 is: 311.66
Step by Step Solution
- Step 1: Write the proportion equation
400.24 : 600.40 = 207.76 : x - Step 2: Convert to fraction form
400.24/600.40 = 207.76/x - Step 3: Cross multiply
400.24x = 600.40 × 207.76 - Step 4: Simplify right side
400.24x = 124,739.10 - Step 5: Solve for x
x = 124,739.10/400.24 - Step 6: Final answer
x = 311.66
Related Problems
Find fourth proportional to 200.12, 300.20 and 103.88
Half scale
Find fourth proportional to 800.48, 1,200.80 and 415.52
Double scale
Find fourth proportional to 401.24, 601.90 and 208.76
Similar ratio
Find fourth proportional to 600.36, 900.60 and 311.64
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.