Finding the Fourth Proportional to 137.21, 189.36 and 81.99
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Solution
The fourth proportional to 137.21, 189.36 and 81.99 is: 113.16
Step by Step Solution
- Step 1: Write the proportion equation
137.21 : 189.36 = 81.99 : x - Step 2: Convert to fraction form
137.21/189.36 = 81.99/x - Step 3: Cross multiply
137.21x = 189.36 × 81.99 - Step 4: Simplify right side
137.21x = 15,525.63 - Step 5: Solve for x
x = 15,525.63/137.21 - Step 6: Final answer
x = 113.16
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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.