Finding the Third Proportional to 638 and 740
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Solution
The third proportional to 638 and 740 is: 858.31
Step by Step Solution
- Step 1: Write the proportion equation
638 : 740 = 740 : x - Step 2: Convert to fraction form
638/740 = 740/x - Step 3: Cross multiply
638x = 740 × 740 - Step 4: Simplify right side
638x = 547,600 - Step 5: Solve for x
x = 547,600/638 - Step 6: Final answer
x = 858.31
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Why These Related Problems?
These problems maintain the same ratio (1.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.