Finding the Fourth Proportional to 157.99, 236.99 and 85.99
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Solution
The fourth proportional to 157.99, 236.99 and 85.99 is: 128.99
Step by Step Solution
- Step 1: Write the proportion equation
157.99 : 236.99 = 85.99 : x - Step 2: Convert to fraction form
157.99/236.99 = 85.99/x - Step 3: Cross multiply
157.99x = 236.99 × 85.99 - Step 4: Simplify right side
157.99x = 20,378.77 - Step 5: Solve for x
x = 20,378.77/157.99 - Step 6: Final answer
x = 128.99
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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.