Home / 518-679.50

Finding the Third Proportional to 518 and 679.50

Calculator

Solution

The third proportional to 518 and 679.50 is: 891.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    518 : 679.50 = 679.50 : x
  2. Step 2: Convert to fraction form
    518/679.50 = 679.50/x
  3. Step 3: Cross multiply
    518x = 679.50 × 679.50
  4. Step 4: Simplify right side
    518x = 461,720.25
  5. Step 5: Solve for x
    x = 461,720.25/518
  6. Step 6: Final answer
    x = 891.35

Related Problems

Find third proportional to 259 and 339.75
Half scale
Find third proportional to 1,036 and 1,359
Double scale
Find third proportional to 520 and 682
Similar ratio
Find third proportional to 777 and 1,019.25
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.