Finding the Fourth Proportional to 641.21, 961.79 and 178.99
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Solution
The fourth proportional to 641.21, 961.79 and 178.99 is: 268.47
Step by Step Solution
- Step 1: Write the proportion equation
641.21 : 961.79 = 178.99 : x - Step 2: Convert to fraction form
641.21/961.79 = 178.99/x - Step 3: Cross multiply
641.21x = 961.79 × 178.99 - Step 4: Simplify right side
641.21x = 172,147.49 - Step 5: Solve for x
x = 172,147.49/641.21 - Step 6: Final answer
x = 268.47
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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.