Finding the Fourth Proportional to 81.05, 121.44 and 53.99
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Solution
The fourth proportional to 81.05, 121.44 and 53.99 is: 80.89
Step by Step Solution
- Step 1: Write the proportion equation
81.05 : 121.44 = 53.99 : x - Step 2: Convert to fraction form
81.05/121.44 = 53.99/x - Step 3: Cross multiply
81.05x = 121.44 × 53.99 - Step 4: Simplify right side
81.05x = 6,555.94 - Step 5: Solve for x
x = 6,555.94/81.05 - Step 6: Final answer
x = 80.89
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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.