Finding the Fourth Proportional to 378.28, 522.07 and 289.63
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Solution
The fourth proportional to 378.28, 522.07 and 289.63 is: 399.72
Step by Step Solution
- Step 1: Write the proportion equation
378.28 : 522.07 = 289.63 : x - Step 2: Convert to fraction form
378.28/522.07 = 289.63/x - Step 3: Cross multiply
378.28x = 522.07 × 289.63 - Step 4: Simplify right side
378.28x = 151,207.13 - Step 5: Solve for x
x = 151,207.13/378.28 - Step 6: Final answer
x = 399.72
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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.