Finding the Fourth Proportional to 126.36, 189.88 and 77.63
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Solution
The fourth proportional to 126.36, 189.88 and 77.63 is: 116.64
Step by Step Solution
- Step 1: Write the proportion equation
126.36 : 189.88 = 77.63 : x - Step 2: Convert to fraction form
126.36/189.88 = 77.63/x - Step 3: Cross multiply
126.36x = 189.88 × 77.63 - Step 4: Simplify right side
126.36x = 14,739.24 - Step 5: Solve for x
x = 14,739.24/126.36 - Step 6: Final answer
x = 116.64
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.