Finding the Third Proportional to 690.50 and 1,015.50
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Solution
The third proportional to 690.50 and 1,015.50 is: 1,493.47
Step by Step Solution
- Step 1: Write the proportion equation
690.50 : 1,015.50 = 1,015.50 : x - Step 2: Convert to fraction form
690.50/1,015.50 = 1,015.50/x - Step 3: Cross multiply
690.50x = 1,015.50 × 1,015.50 - Step 4: Simplify right side
690.50x = 1,031,240.25 - Step 5: Solve for x
x = 1,031,240.25/690.50 - Step 6: Final answer
x = 1,493.47
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Why These Related Problems?
These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.