Finding the Fourth Proportional to 312.08, 430.34 and 218.79
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Solution
The fourth proportional to 312.08, 430.34 and 218.79 is: 301.70
Step by Step Solution
- Step 1: Write the proportion equation
312.08 : 430.34 = 218.79 : x - Step 2: Convert to fraction form
312.08/430.34 = 218.79/x - Step 3: Cross multiply
312.08x = 430.34 × 218.79 - Step 4: Simplify right side
312.08x = 94,152.99 - Step 5: Solve for x
x = 94,152.99/312.08 - Step 6: Final answer
x = 301.70
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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.