Finding the Fourth Proportional to 207.79, 311.65 and 84.31
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Solution
The fourth proportional to 207.79, 311.65 and 84.31 is: 126.45
Step by Step Solution
- Step 1: Write the proportion equation
207.79 : 311.65 = 84.31 : x - Step 2: Convert to fraction form
207.79/311.65 = 84.31/x - Step 3: Cross multiply
207.79x = 311.65 × 84.31 - Step 4: Simplify right side
207.79x = 26,274.22 - Step 5: Solve for x
x = 26,274.22/207.79 - Step 6: Final answer
x = 126.45
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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.