Finding the Fourth Proportional to 87.99, 121.37 and 55.18
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Solution
The fourth proportional to 87.99, 121.37 and 55.18 is: 76.12
Step by Step Solution
- Step 1: Write the proportion equation
87.99 : 121.37 = 55.18 : x - Step 2: Convert to fraction form
87.99/121.37 = 55.18/x - Step 3: Cross multiply
87.99x = 121.37 × 55.18 - Step 4: Simplify right side
87.99x = 6,697.06 - Step 5: Solve for x
x = 6,697.06/87.99 - Step 6: Final answer
x = 76.12
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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.