Finding the Third Proportional to 392 and 691
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Solution
The third proportional to 392 and 691 is: 1,218.06
Step by Step Solution
- Step 1: Write the proportion equation
392 : 691 = 691 : x - Step 2: Convert to fraction form
392/691 = 691/x - Step 3: Cross multiply
392x = 691 × 691 - Step 4: Simplify right side
392x = 477,481 - Step 5: Solve for x
x = 477,481/392 - Step 6: Final answer
x = 1,218.06
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These problems maintain the same ratio (1.76) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.