Finding the Fourth Proportional to 138.75, 207.63 and 130.83
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Solution
The fourth proportional to 138.75, 207.63 and 130.83 is: 195.78
Step by Step Solution
- Step 1: Write the proportion equation
138.75 : 207.63 = 130.83 : x - Step 2: Convert to fraction form
138.75/207.63 = 130.83/x - Step 3: Cross multiply
138.75x = 207.63 × 130.83 - Step 4: Simplify right side
138.75x = 27,164.23 - Step 5: Solve for x
x = 27,164.23/138.75 - Step 6: Final answer
x = 195.78
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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.