Finding the Third Proportional to 815 and 980
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Solution
The third proportional to 815 and 980 is: 1,178.40
Step by Step Solution
- Step 1: Write the proportion equation
815 : 980 = 980 : x - Step 2: Convert to fraction form
815/980 = 980/x - Step 3: Cross multiply
815x = 980 × 980 - Step 4: Simplify right side
815x = 960,400 - Step 5: Solve for x
x = 960,400/815 - Step 6: Final answer
x = 1,178.40
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Why These Related Problems?
These problems maintain the same ratio (1.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.