Finding the Fourth Proportional to 159.89, 239.74 and 78.69
Calculator
Solution
The fourth proportional to 159.89, 239.74 and 78.69 is: 117.99
Step by Step Solution
- Step 1: Write the proportion equation
159.89 : 239.74 = 78.69 : x - Step 2: Convert to fraction form
159.89/239.74 = 78.69/x - Step 3: Cross multiply
159.89x = 239.74 × 78.69 - Step 4: Simplify right side
159.89x = 18,864.94 - Step 5: Solve for x
x = 18,864.94/159.89 - Step 6: Final answer
x = 117.99
Related Problems
Find fourth proportional to 79.95, 119.87 and 39.35
Half scale
Find fourth proportional to 319.79, 479.48 and 157.38
Double scale
Find fourth proportional to 160.89, 241.24 and 79.69
Similar ratio
Find fourth proportional to 239.84, 359.61 and 118.04
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.