Finding the Fourth Proportional to 138.31, 207.64 and 126.99
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Solution
The fourth proportional to 138.31, 207.64 and 126.99 is: 190.65
Step by Step Solution
- Step 1: Write the proportion equation
138.31 : 207.64 = 126.99 : x - Step 2: Convert to fraction form
138.31/207.64 = 126.99/x - Step 3: Cross multiply
138.31x = 207.64 × 126.99 - Step 4: Simplify right side
138.31x = 26,368.20 - Step 5: Solve for x
x = 26,368.20/138.31 - Step 6: Final answer
x = 190.65
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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.