Finding the Fourth Proportional to 427.63, 640.36 and 391.99
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Solution
The fourth proportional to 427.63, 640.36 and 391.99 is: 586.99
Step by Step Solution
- Step 1: Write the proportion equation
427.63 : 640.36 = 391.99 : x - Step 2: Convert to fraction form
427.63/640.36 = 391.99/x - Step 3: Cross multiply
427.63x = 640.36 × 391.99 - Step 4: Simplify right side
427.63x = 251,014.72 - Step 5: Solve for x
x = 251,014.72/427.63 - Step 6: Final answer
x = 586.99
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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.