Finding the Fourth Proportional to 283.10, 390.21 and 223.70
Calculator
Solution
The fourth proportional to 283.10, 390.21 and 223.70 is: 308.34
Step by Step Solution
- Step 1: Write the proportion equation
283.10 : 390.21 = 223.70 : x - Step 2: Convert to fraction form
283.10/390.21 = 223.70/x - Step 3: Cross multiply
283.10x = 390.21 × 223.70 - Step 4: Simplify right side
283.10x = 87,289.98 - Step 5: Solve for x
x = 87,289.98/283.10 - Step 6: Final answer
x = 308.34
Related Problems
Find fourth proportional to 141.55, 195.11 and 111.85
Half scale
Find fourth proportional to 566.20, 780.42 and 447.40
Double scale
Find fourth proportional to 284.10, 391.59 and 224.70
Similar ratio
Find fourth proportional to 424.65, 585.32 and 335.55
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.