Home / 316.50-648.75

Finding the Third Proportional to 316.50 and 648.75

Calculator

Solution

The third proportional to 316.50 and 648.75 is: 1,329.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.50 : 648.75 = 648.75 : x
  2. Step 2: Convert to fraction form
    316.50/648.75 = 648.75/x
  3. Step 3: Cross multiply
    316.50x = 648.75 × 648.75
  4. Step 4: Simplify right side
    316.50x = 420,876.56
  5. Step 5: Solve for x
    x = 420,876.56/316.50
  6. Step 6: Final answer
    x = 1,329.78

Related Problems

Find third proportional to 158.25 and 324.38
Half scale
Find third proportional to 633 and 1,297.50
Double scale
Find third proportional to 319 and 653
Similar ratio
Find third proportional to 474.75 and 973.13
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.05) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.