Finding the Fourth Proportional to 90.90, 136.08 and 59.99
Calculator
Solution
The fourth proportional to 90.90, 136.08 and 59.99 is: 89.81
Step by Step Solution
- Step 1: Write the proportion equation
90.90 : 136.08 = 59.99 : x - Step 2: Convert to fraction form
90.90/136.08 = 59.99/x - Step 3: Cross multiply
90.90x = 136.08 × 59.99 - Step 4: Simplify right side
90.90x = 8,164.03 - Step 5: Solve for x
x = 8,164.03/90.90 - Step 6: Final answer
x = 89.81
Related Problems
Find fourth proportional to 45.45, 68.04 and 30.00
Half scale
Find fourth proportional to 181.80, 272.16 and 119.99
Double scale
Find fourth proportional to 91.90, 137.58 and 60.99
Similar ratio
Find fourth proportional to 136.35, 204.12 and 89.99
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.