Home / 622.50-690

Finding the Third Proportional to 622.50 and 690

Calculator

Solution

The third proportional to 622.50 and 690 is: 764.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.50 : 690 = 690 : x
  2. Step 2: Convert to fraction form
    622.50/690 = 690/x
  3. Step 3: Cross multiply
    622.50x = 690 × 690
  4. Step 4: Simplify right side
    622.50x = 476,100
  5. Step 5: Solve for x
    x = 476,100/622.50
  6. Step 6: Final answer
    x = 764.82

Related Problems

Find third proportional to 311.25 and 345
Half scale
Find third proportional to 1,245 and 1,380
Double scale
Find third proportional to 625 and 692
Similar ratio
Find third proportional to 933.75 and 1,035
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.