Finding the Fourth Proportional to 85.94, 129.15 and 80.09
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Solution
The fourth proportional to 85.94, 129.15 and 80.09 is: 120.37
Step by Step Solution
- Step 1: Write the proportion equation
85.94 : 129.15 = 80.09 : x - Step 2: Convert to fraction form
85.94/129.15 = 80.09/x - Step 3: Cross multiply
85.94x = 129.15 × 80.09 - Step 4: Simplify right side
85.94x = 10,344.05 - Step 5: Solve for x
x = 10,344.05/85.94 - Step 6: Final answer
x = 120.37
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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.