Finding the Fourth Proportional to 430.99, 646.19 and 257.22
Calculator
Solution
The fourth proportional to 430.99, 646.19 and 257.22 is: 385.65
Step by Step Solution
- Step 1: Write the proportion equation
430.99 : 646.19 = 257.22 : x - Step 2: Convert to fraction form
430.99/646.19 = 257.22/x - Step 3: Cross multiply
430.99x = 646.19 × 257.22 - Step 4: Simplify right side
430.99x = 166,212.99 - Step 5: Solve for x
x = 166,212.99/430.99 - Step 6: Final answer
x = 385.65
Related Problems
Find fourth proportional to 215.50, 323.10 and 128.61
Half scale
Find fourth proportional to 861.98, 1,292.38 and 514.44
Double scale
Find fourth proportional to 431.99, 647.69 and 258.22
Similar ratio
Find fourth proportional to 646.49, 969.29 and 385.83
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.