Finding the Fourth Proportional to 206.68, 309.88 and 84.91
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Solution
The fourth proportional to 206.68, 309.88 and 84.91 is: 127.31
Step by Step Solution
- Step 1: Write the proportion equation
206.68 : 309.88 = 84.91 : x - Step 2: Convert to fraction form
206.68/309.88 = 84.91/x - Step 3: Cross multiply
206.68x = 309.88 × 84.91 - Step 4: Simplify right side
206.68x = 26,311.91 - Step 5: Solve for x
x = 26,311.91/206.68 - Step 6: Final answer
x = 127.31
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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.