Finding the Fourth Proportional to 126.19, 189.15 and 71.99
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Solution
The fourth proportional to 126.19, 189.15 and 71.99 is: 107.91
Step by Step Solution
- Step 1: Write the proportion equation
126.19 : 189.15 = 71.99 : x - Step 2: Convert to fraction form
126.19/189.15 = 71.99/x - Step 3: Cross multiply
126.19x = 189.15 × 71.99 - Step 4: Simplify right side
126.19x = 13,616.91 - Step 5: Solve for x
x = 13,616.91/126.19 - Step 6: Final answer
x = 107.91
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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.