Finding the Fourth Proportional to 378.95, 523.05 and 221.63
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Solution
The fourth proportional to 378.95, 523.05 and 221.63 is: 305.90
Step by Step Solution
- Step 1: Write the proportion equation
378.95 : 523.05 = 221.63 : x - Step 2: Convert to fraction form
378.95/523.05 = 221.63/x - Step 3: Cross multiply
378.95x = 523.05 × 221.63 - Step 4: Simplify right side
378.95x = 115,920.96 - Step 5: Solve for x
x = 115,920.96/378.95 - Step 6: Final answer
x = 305.90
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Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.