Finding the Fourth Proportional to 387.20, 534.18 and 239.68
Calculator
Solution
The fourth proportional to 387.20, 534.18 and 239.68 is: 330.66
Step by Step Solution
- Step 1: Write the proportion equation
387.20 : 534.18 = 239.68 : x - Step 2: Convert to fraction form
387.20/534.18 = 239.68/x - Step 3: Cross multiply
387.20x = 534.18 × 239.68 - Step 4: Simplify right side
387.20x = 128,032.26 - Step 5: Solve for x
x = 128,032.26/387.20 - Step 6: Final answer
x = 330.66
Related Problems
Find fourth proportional to 193.60, 267.09 and 119.84
Half scale
Find fourth proportional to 774.40, 1,068.36 and 479.36
Double scale
Find fourth proportional to 388.20, 535.56 and 240.68
Similar ratio
Find fourth proportional to 580.80, 801.27 and 359.52
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.