Finding the Fourth Proportional to 138.12, 189.36 and 135.99
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Solution
The fourth proportional to 138.12, 189.36 and 135.99 is: 186.44
Step by Step Solution
- Step 1: Write the proportion equation
138.12 : 189.36 = 135.99 : x - Step 2: Convert to fraction form
138.12/189.36 = 135.99/x - Step 3: Cross multiply
138.12x = 189.36 × 135.99 - Step 4: Simplify right side
138.12x = 25,751.07 - Step 5: Solve for x
x = 25,751.07/138.12 - Step 6: Final answer
x = 186.44
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Why These Related Problems?
These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.