Home / 620.81-805.69

Finding the Third Proportional to 620.81 and 805.69

Calculator

Solution

The third proportional to 620.81 and 805.69 is: 1,045.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.81 : 805.69 = 805.69 : x
  2. Step 2: Convert to fraction form
    620.81/805.69 = 805.69/x
  3. Step 3: Cross multiply
    620.81x = 805.69 × 805.69
  4. Step 4: Simplify right side
    620.81x = 649,132.35
  5. Step 5: Solve for x
    x = 649,132.35/620.81
  6. Step 6: Final answer
    x = 1,045.62

Related Problems

Find third proportional to 310.41 and 402.84
Half scale
Find third proportional to 1,241.63 and 1,611.38
Double scale
Find third proportional to 623 and 808
Similar ratio
Find third proportional to 931.22 and 1,208.53
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.