Finding the Fourth Proportional to 391.70, 586.92 and 318.21
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Solution
The fourth proportional to 391.70, 586.92 and 318.21 is: 476.82
Step by Step Solution
- Step 1: Write the proportion equation
391.70 : 586.92 = 318.21 : x - Step 2: Convert to fraction form
391.70/586.92 = 318.21/x - Step 3: Cross multiply
391.70x = 586.92 × 318.21 - Step 4: Simplify right side
391.70x = 186,767.21 - Step 5: Solve for x
x = 186,767.21/391.70 - Step 6: Final answer
x = 476.82
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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.