Finding the Fourth Proportional to 15.09, 20.81 and 11.59
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Solution
The fourth proportional to 15.09, 20.81 and 11.59 is: 15.99
Step by Step Solution
- Step 1: Write the proportion equation
15.09 : 20.81 = 11.59 : x - Step 2: Convert to fraction form
15.09/20.81 = 11.59/x - Step 3: Cross multiply
15.09x = 20.81 × 11.59 - Step 4: Simplify right side
15.09x = 241.22 - Step 5: Solve for x
x = 241.22/15.09 - Step 6: Final answer
x = 15.99
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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.