Finding the Fourth Proportional to 381.20, 572.09 and 218.99
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Solution
The fourth proportional to 381.20, 572.09 and 218.99 is: 328.65
Step by Step Solution
- Step 1: Write the proportion equation
381.20 : 572.09 = 218.99 : x - Step 2: Convert to fraction form
381.20/572.09 = 218.99/x - Step 3: Cross multiply
381.20x = 572.09 × 218.99 - Step 4: Simplify right side
381.20x = 125,278.03 - Step 5: Solve for x
x = 125,278.03/381.20 - Step 6: Final answer
x = 328.65
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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.