Finding the Fourth Proportional to 985.68, 1,359.36 and 636
Calculator
Solution
The fourth proportional to 985.68, 1,359.36 and 636 is: 877.11
Step by Step Solution
- Step 1: Write the proportion equation
985.68 : 1,359.36 = 636 : x - Step 2: Convert to fraction form
985.68/1,359.36 = 636/x - Step 3: Cross multiply
985.68x = 1,359.36 × 636 - Step 4: Simplify right side
985.68x = 864,552.96 - Step 5: Solve for x
x = 864,552.96/985.68 - Step 6: Final answer
x = 877.11
Related Problems
Find fourth proportional to 492.84, 679.68 and 318
Half scale
Find fourth proportional to 1,971.36, 2,718.72 and 1,272
Double scale
Find fourth proportional to 986.68, 1,360.74 and 637
Similar ratio
Find fourth proportional to 1,478.52, 2,039.04 and 954
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.