Finding the Fourth Proportional to 312.91, 431.93 and 202.43
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Solution
The fourth proportional to 312.91, 431.93 and 202.43 is: 279.43
Step by Step Solution
- Step 1: Write the proportion equation
312.91 : 431.93 = 202.43 : x - Step 2: Convert to fraction form
312.91/431.93 = 202.43/x - Step 3: Cross multiply
312.91x = 431.93 × 202.43 - Step 4: Simplify right side
312.91x = 87,437.18 - Step 5: Solve for x
x = 87,437.18/312.91 - Step 6: Final answer
x = 279.43
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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.