Home / 485.25-621

Finding the Third Proportional to 485.25 and 621

Calculator

Solution

The third proportional to 485.25 and 621 is: 794.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.25 : 621 = 621 : x
  2. Step 2: Convert to fraction form
    485.25/621 = 621/x
  3. Step 3: Cross multiply
    485.25x = 621 × 621
  4. Step 4: Simplify right side
    485.25x = 385,641
  5. Step 5: Solve for x
    x = 385,641/485.25
  6. Step 6: Final answer
    x = 794.73

Related Problems

Find third proportional to 242.63 and 310.50
Half scale
Find third proportional to 970.50 and 1,242
Double scale
Find third proportional to 487 and 624
Similar ratio
Find third proportional to 727.88 and 931.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.