Finding the Fourth Proportional to 87.68, 121.07 and 54.99
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Solution
The fourth proportional to 87.68, 121.07 and 54.99 is: 75.93
Step by Step Solution
- Step 1: Write the proportion equation
87.68 : 121.07 = 54.99 : x - Step 2: Convert to fraction form
87.68/121.07 = 54.99/x - Step 3: Cross multiply
87.68x = 121.07 × 54.99 - Step 4: Simplify right side
87.68x = 6,657.64 - Step 5: Solve for x
x = 6,657.64/87.68 - Step 6: Final answer
x = 75.93
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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.