Finding the Fourth Proportional to 207.18, 309.99 and 138.87
Calculator
Solution
The fourth proportional to 207.18, 309.99 and 138.87 is: 207.78
Step by Step Solution
- Step 1: Write the proportion equation
207.18 : 309.99 = 138.87 : x - Step 2: Convert to fraction form
207.18/309.99 = 138.87/x - Step 3: Cross multiply
207.18x = 309.99 × 138.87 - Step 4: Simplify right side
207.18x = 43,048.31 - Step 5: Solve for x
x = 43,048.31/207.18 - Step 6: Final answer
x = 207.78
Related Problems
Find fourth proportional to 103.59, 155.00 and 69.44
Half scale
Find fourth proportional to 414.36, 619.98 and 277.74
Double scale
Find fourth proportional to 208.18, 311.49 and 139.87
Similar ratio
Find fourth proportional to 310.77, 464.99 and 208.31
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.