Finding the Fourth Proportional to 878.97, 1,212.97 and 485.99
Calculator
Solution
The fourth proportional to 878.97, 1,212.97 and 485.99 is: 670.65
Step by Step Solution
- Step 1: Write the proportion equation
878.97 : 1,212.97 = 485.99 : x - Step 2: Convert to fraction form
878.97/1,212.97 = 485.99/x - Step 3: Cross multiply
878.97x = 1,212.97 × 485.99 - Step 4: Simplify right side
878.97x = 589,482.80 - Step 5: Solve for x
x = 589,482.80/878.97 - Step 6: Final answer
x = 670.65
Related Problems
Find fourth proportional to 439.49, 606.48 and 242.99
Half scale
Find fourth proportional to 1,757.94, 2,425.93 and 971.97
Double scale
Find fourth proportional to 879.97, 1,214.34 and 486.99
Similar ratio
Find fourth proportional to 1,318.46, 1,819.45 and 728.98
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.