Finding the Fourth Proportional to 378.08, 521.08 and 318.96
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Solution
The fourth proportional to 378.08, 521.08 and 318.96 is: 439.60
Step by Step Solution
- Step 1: Write the proportion equation
378.08 : 521.08 = 318.96 : x - Step 2: Convert to fraction form
378.08/521.08 = 318.96/x - Step 3: Cross multiply
378.08x = 521.08 × 318.96 - Step 4: Simplify right side
378.08x = 166,203.68 - Step 5: Solve for x
x = 166,203.68/378.08 - Step 6: Final answer
x = 439.60
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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.