Finding the Fourth Proportional to 311.95, 430.14 and 201.28
Calculator
Solution
The fourth proportional to 311.95, 430.14 and 201.28 is: 277.54
Step by Step Solution
- Step 1: Write the proportion equation
311.95 : 430.14 = 201.28 : x - Step 2: Convert to fraction form
311.95/430.14 = 201.28/x - Step 3: Cross multiply
311.95x = 430.14 × 201.28 - Step 4: Simplify right side
311.95x = 86,578.58 - Step 5: Solve for x
x = 86,578.58/311.95 - Step 6: Final answer
x = 277.54
Related Problems
Find fourth proportional to 155.98, 215.07 and 100.64
Half scale
Find fourth proportional to 623.90, 860.28 and 402.56
Double scale
Find fourth proportional to 312.95, 431.52 and 202.28
Similar ratio
Find fourth proportional to 467.93, 645.21 and 301.92
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.