Finding the Fourth Proportional to 664.62, 916.79 and 398.99
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Solution
The fourth proportional to 664.62, 916.79 and 398.99 is: 550.37
Step by Step Solution
- Step 1: Write the proportion equation
664.62 : 916.79 = 398.99 : x - Step 2: Convert to fraction form
664.62/916.79 = 398.99/x - Step 3: Cross multiply
664.62x = 916.79 × 398.99 - Step 4: Simplify right side
664.62x = 365,785.46 - Step 5: Solve for x
x = 365,785.46/664.62 - Step 6: Final answer
x = 550.37
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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.