Finding the Fourth Proportional to 312.12, 431.34 and 252.99
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Solution
The fourth proportional to 312.12, 431.34 and 252.99 is: 349.62
Step by Step Solution
- Step 1: Write the proportion equation
312.12 : 431.34 = 252.99 : x - Step 2: Convert to fraction form
312.12/431.34 = 252.99/x - Step 3: Cross multiply
312.12x = 431.34 × 252.99 - Step 4: Simplify right side
312.12x = 109,124.71 - Step 5: Solve for x
x = 109,124.71/312.12 - Step 6: Final answer
x = 349.62
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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.