Home / 679.50-699

Finding the Third Proportional to 679.50 and 699

Calculator

Solution

The third proportional to 679.50 and 699 is: 719.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.50 : 699 = 699 : x
  2. Step 2: Convert to fraction form
    679.50/699 = 699/x
  3. Step 3: Cross multiply
    679.50x = 699 × 699
  4. Step 4: Simplify right side
    679.50x = 488,601
  5. Step 5: Solve for x
    x = 488,601/679.50
  6. Step 6: Final answer
    x = 719.06

Related Problems

Find third proportional to 339.75 and 349.50
Half scale
Find third proportional to 1,359 and 1,398
Double scale
Find third proportional to 682 and 701
Similar ratio
Find third proportional to 1,019.25 and 1,048.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.03) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.