Finding the Fourth Proportional to 79.68, 119.67 and 68.88
Calculator
Solution
The fourth proportional to 79.68, 119.67 and 68.88 is: 103.45
Step by Step Solution
- Step 1: Write the proportion equation
79.68 : 119.67 = 68.88 : x - Step 2: Convert to fraction form
79.68/119.67 = 68.88/x - Step 3: Cross multiply
79.68x = 119.67 × 68.88 - Step 4: Simplify right side
79.68x = 8,242.87 - Step 5: Solve for x
x = 8,242.87/79.68 - Step 6: Final answer
x = 103.45
Related Problems
Find fourth proportional to 39.84, 59.84 and 34.44
Half scale
Find fourth proportional to 159.36, 239.34 and 137.76
Double scale
Find fourth proportional to 80.68, 121.17 and 69.88
Similar ratio
Find fourth proportional to 119.52, 179.51 and 103.32
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.