Finding the Fourth Proportional to 659.97, 989.80 and 424.99
Calculator
Solution
The fourth proportional to 659.97, 989.80 and 424.99 is: 637.39
Step by Step Solution
- Step 1: Write the proportion equation
659.97 : 989.80 = 424.99 : x - Step 2: Convert to fraction form
659.97/989.80 = 424.99/x - Step 3: Cross multiply
659.97x = 989.80 × 424.99 - Step 4: Simplify right side
659.97x = 420,655.10 - Step 5: Solve for x
x = 420,655.10/659.97 - Step 6: Final answer
x = 637.39
Related Problems
Find fourth proportional to 329.99, 494.90 and 212.50
Half scale
Find fourth proportional to 1,319.94, 1,979.60 and 849.98
Double scale
Find fourth proportional to 660.97, 991.30 and 425.99
Similar ratio
Find fourth proportional to 989.96, 1,484.70 and 637.49
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.