Finding the Fourth Proportional to 99.39, 137.14 and 80.94
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Solution
The fourth proportional to 99.39, 137.14 and 80.94 is: 111.68
Step by Step Solution
- Step 1: Write the proportion equation
99.39 : 137.14 = 80.94 : x - Step 2: Convert to fraction form
99.39/137.14 = 80.94/x - Step 3: Cross multiply
99.39x = 137.14 × 80.94 - Step 4: Simplify right side
99.39x = 11,100.49 - Step 5: Solve for x
x = 11,100.49/99.39 - Step 6: Final answer
x = 111.68
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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.