Finding the Fourth Proportional to 207,511.80, 311,267.70 and 128,779.80
Calculator
Solution
The fourth proportional to 207,511.80, 311,267.70 and 128,779.80 is: 193,169.70
Step by Step Solution
- Step 1: Write the proportion equation
207,511.80 : 311,267.70 = 128,779.80 : x - Step 2: Convert to fraction form
207,511.80/311,267.70 = 128,779.80/x - Step 3: Cross multiply
207,511.80x = 311,267.70 × 128,779.80 - Step 4: Simplify right side
207,511.80x = 40,084,992,152.46 - Step 5: Solve for x
x = 40,084,992,152.46/207,511.80 - Step 6: Final answer
x = 193,169.70
Related Problems
Find fourth proportional to 103,755.90, 155,633.85 and 64,389.90
Half scale
Find fourth proportional to 415,023.60, 622,535.40 and 257,559.60
Double scale
Find fourth proportional to 207,512.80, 311,269.20 and 128,780.80
Similar ratio
Find fourth proportional to 311,267.70, 466,901.55 and 193,169.70
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.