Home / 487.50-648.75

Finding the Third Proportional to 487.50 and 648.75

Calculator

Solution

The third proportional to 487.50 and 648.75 is: 863.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.50 : 648.75 = 648.75 : x
  2. Step 2: Convert to fraction form
    487.50/648.75 = 648.75/x
  3. Step 3: Cross multiply
    487.50x = 648.75 × 648.75
  4. Step 4: Simplify right side
    487.50x = 420,876.56
  5. Step 5: Solve for x
    x = 420,876.56/487.50
  6. Step 6: Final answer
    x = 863.34

Related Problems

Find third proportional to 243.75 and 324.38
Half scale
Find third proportional to 975 and 1,297.50
Double scale
Find third proportional to 490 and 651
Similar ratio
Find third proportional to 731.25 and 973.13
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.