Finding the Fourth Proportional to 405.64, 559.79 and 230.99
Calculator
Solution
The fourth proportional to 405.64, 559.79 and 230.99 is: 318.76
Step by Step Solution
- Step 1: Write the proportion equation
405.64 : 559.79 = 230.99 : x - Step 2: Convert to fraction form
405.64/559.79 = 230.99/x - Step 3: Cross multiply
405.64x = 559.79 × 230.99 - Step 4: Simplify right side
405.64x = 129,302.52 - Step 5: Solve for x
x = 129,302.52/405.64 - Step 6: Final answer
x = 318.76
Related Problems
Find fourth proportional to 202.82, 279.89 and 115.49
Half scale
Find fourth proportional to 811.28, 1,119.58 and 461.97
Double scale
Find fourth proportional to 406.64, 561.17 and 231.99
Similar ratio
Find fourth proportional to 608.46, 839.68 and 346.48
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.