Finding the Fourth Proportional to 138.69, 208.08 and 126.63
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Solution
The fourth proportional to 138.69, 208.08 and 126.63 is: 189.99
Step by Step Solution
- Step 1: Write the proportion equation
138.69 : 208.08 = 126.63 : x - Step 2: Convert to fraction form
138.69/208.08 = 126.63/x - Step 3: Cross multiply
138.69x = 208.08 × 126.63 - Step 4: Simplify right side
138.69x = 26,349.17 - Step 5: Solve for x
x = 26,349.17/138.69 - Step 6: Final answer
x = 189.99
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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.