Finding the Third Proportional to 278 and 645.50
Calculator
Solution
The third proportional to 278 and 645.50 is: 1,498.81
Step by Step Solution
- Step 1: Write the proportion equation
278 : 645.50 = 645.50 : x - Step 2: Convert to fraction form
278/645.50 = 645.50/x - Step 3: Cross multiply
278x = 645.50 × 645.50 - Step 4: Simplify right side
278x = 416,670.25 - Step 5: Solve for x
x = 416,670.25/278 - Step 6: Final answer
x = 1,498.81
Related Problems
Find third proportional to 139 and 322.75
Half scale
Find third proportional to 556 and 1,291
Double scale
Find third proportional to 280 and 650
Similar ratio
Find third proportional to 417 and 968.25
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (2.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.