Finding the Fourth Proportional to 378.99, 522.95 and 239.13
Calculator
Solution
The fourth proportional to 378.99, 522.95 and 239.13 is: 329.96
Step by Step Solution
- Step 1: Write the proportion equation
378.99 : 522.95 = 239.13 : x - Step 2: Convert to fraction form
378.99/522.95 = 239.13/x - Step 3: Cross multiply
378.99x = 522.95 × 239.13 - Step 4: Simplify right side
378.99x = 125,051.84 - Step 5: Solve for x
x = 125,051.84/378.99 - Step 6: Final answer
x = 329.96
Related Problems
Find fourth proportional to 189.50, 261.47 and 119.57
Half scale
Find fourth proportional to 757.98, 1,045.89 and 478.26
Double scale
Find fourth proportional to 379.99, 524.32 and 240.13
Similar ratio
Find fourth proportional to 568.49, 784.42 and 358.70
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.