Finding the Fourth Proportional to 355.59, 490.73 and 215.75
Calculator
Solution
The fourth proportional to 355.59, 490.73 and 215.75 is: 297.75
Step by Step Solution
- Step 1: Write the proportion equation
355.59 : 490.73 = 215.75 : x - Step 2: Convert to fraction form
355.59/490.73 = 215.75/x - Step 3: Cross multiply
355.59x = 490.73 × 215.75 - Step 4: Simplify right side
355.59x = 105,875.15 - Step 5: Solve for x
x = 105,875.15/355.59 - Step 6: Final answer
x = 297.75
Related Problems
Find fourth proportional to 177.80, 245.36 and 107.88
Half scale
Find fourth proportional to 711.18, 981.45 and 431.51
Double scale
Find fourth proportional to 356.59, 492.11 and 216.75
Similar ratio
Find fourth proportional to 533.39, 736.09 and 323.63
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.