Finding the Fourth Proportional to 87.75, 121.08 and 54.99
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Solution
The fourth proportional to 87.75, 121.08 and 54.99 is: 75.88
Step by Step Solution
- Step 1: Write the proportion equation
87.75 : 121.08 = 54.99 : x - Step 2: Convert to fraction form
87.75/121.08 = 54.99/x - Step 3: Cross multiply
87.75x = 121.08 × 54.99 - Step 4: Simplify right side
87.75x = 6,658.19 - Step 5: Solve for x
x = 6,658.19/87.75 - Step 6: Final answer
x = 75.88
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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.