Finding the Fourth Proportional to 206.63, 309.70 and 84.74
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Solution
The fourth proportional to 206.63, 309.70 and 84.74 is: 127.01
Step by Step Solution
- Step 1: Write the proportion equation
206.63 : 309.70 = 84.74 : x - Step 2: Convert to fraction form
206.63/309.70 = 84.74/x - Step 3: Cross multiply
206.63x = 309.70 × 84.74 - Step 4: Simplify right side
206.63x = 26,243.55 - Step 5: Solve for x
x = 26,243.55/206.63 - Step 6: Final answer
x = 127.01
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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.