Finding the Third Proportional to 276 and 638
Calculator
Solution
The third proportional to 276 and 638 is: 1,474.80
Step by Step Solution
- Step 1: Write the proportion equation
276 : 638 = 638 : x - Step 2: Convert to fraction form
276/638 = 638/x - Step 3: Cross multiply
276x = 638 × 638 - Step 4: Simplify right side
276x = 407,044 - Step 5: Solve for x
x = 407,044/276 - Step 6: Final answer
x = 1,474.80
Related Problems
Find third proportional to 138 and 319
Half scale
Find third proportional to 552 and 1,276
Double scale
Find third proportional to 278 and 643
Similar ratio
Find third proportional to 414 and 957
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (2.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.