Finding the Fourth Proportional to 81.63, 122.49 and 72.99
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Solution
The fourth proportional to 81.63, 122.49 and 72.99 is: 109.53
Step by Step Solution
- Step 1: Write the proportion equation
81.63 : 122.49 = 72.99 : x - Step 2: Convert to fraction form
81.63/122.49 = 72.99/x - Step 3: Cross multiply
81.63x = 122.49 × 72.99 - Step 4: Simplify right side
81.63x = 8,940.55 - Step 5: Solve for x
x = 8,940.55/81.63 - Step 6: Final answer
x = 109.53
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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.