Finding the Fourth Proportional to 89.19, 122.72 and 81.99
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Solution
The fourth proportional to 89.19, 122.72 and 81.99 is: 112.81
Step by Step Solution
- Step 1: Write the proportion equation
89.19 : 122.72 = 81.99 : x - Step 2: Convert to fraction form
89.19/122.72 = 81.99/x - Step 3: Cross multiply
89.19x = 122.72 × 81.99 - Step 4: Simplify right side
89.19x = 10,061.81 - Step 5: Solve for x
x = 10,061.81/89.19 - Step 6: Final answer
x = 112.81
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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.