Finding the Fourth Proportional to 318.25, 438.79 and 276.13
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Solution
The fourth proportional to 318.25, 438.79 and 276.13 is: 380.72
Step by Step Solution
- Step 1: Write the proportion equation
318.25 : 438.79 = 276.13 : x - Step 2: Convert to fraction form
318.25/438.79 = 276.13/x - Step 3: Cross multiply
318.25x = 438.79 × 276.13 - Step 4: Simplify right side
318.25x = 121,163.08 - Step 5: Solve for x
x = 121,163.08/318.25 - Step 6: Final answer
x = 380.72
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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.