Finding the Third Proportional to 639 and 1,419
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Solution
The third proportional to 639 and 1,419 is: 3,151.11
Step by Step Solution
- Step 1: Write the proportion equation
639 : 1,419 = 1,419 : x - Step 2: Convert to fraction form
639/1,419 = 1,419/x - Step 3: Cross multiply
639x = 1,419 × 1,419 - Step 4: Simplify right side
639x = 2,013,561 - Step 5: Solve for x
x = 2,013,561/639 - Step 6: Final answer
x = 3,151.11
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Why These Related Problems?
These problems maintain the same ratio (2.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.