Finding the Fourth Proportional to 315.19, 472.79 and 84.09
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Solution
The fourth proportional to 315.19, 472.79 and 84.09 is: 126.14
Step by Step Solution
- Step 1: Write the proportion equation
315.19 : 472.79 = 84.09 : x - Step 2: Convert to fraction form
315.19/472.79 = 84.09/x - Step 3: Cross multiply
315.19x = 472.79 × 84.09 - Step 4: Simplify right side
315.19x = 39,757.12 - Step 5: Solve for x
x = 39,757.12/315.19 - Step 6: Final answer
x = 126.14
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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.