Finding the Fourth Proportional to 91.19, 135.99 and 81.36
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Solution
The fourth proportional to 91.19, 135.99 and 81.36 is: 121.32
Step by Step Solution
- Step 1: Write the proportion equation
91.19 : 135.99 = 81.36 : x - Step 2: Convert to fraction form
91.19/135.99 = 81.36/x - Step 3: Cross multiply
91.19x = 135.99 × 81.36 - Step 4: Simplify right side
91.19x = 11,063.06 - Step 5: Solve for x
x = 11,063.06/91.19 - Step 6: Final answer
x = 121.32
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Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.