Finding the Fourth Proportional to 208.84, 312.99 and 86.95
Calculator
Solution
The fourth proportional to 208.84, 312.99 and 86.95 is: 130.31
Step by Step Solution
- Step 1: Write the proportion equation
208.84 : 312.99 = 86.95 : x - Step 2: Convert to fraction form
208.84/312.99 = 86.95/x - Step 3: Cross multiply
208.84x = 312.99 × 86.95 - Step 4: Simplify right side
208.84x = 27,214.48 - Step 5: Solve for x
x = 27,214.48/208.84 - Step 6: Final answer
x = 130.31
Related Problems
Find fourth proportional to 104.42, 156.50 and 43.48
Half scale
Find fourth proportional to 417.68, 625.98 and 173.90
Double scale
Find fourth proportional to 209.84, 314.49 and 87.95
Similar ratio
Find fourth proportional to 313.26, 469.49 and 130.43
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.