Home / 807-861

Finding the Third Proportional to 807 and 861

Calculator

Solution

The third proportional to 807 and 861 is: 918.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    807 : 861 = 861 : x
  2. Step 2: Convert to fraction form
    807/861 = 861/x
  3. Step 3: Cross multiply
    807x = 861 × 861
  4. Step 4: Simplify right side
    807x = 741,321
  5. Step 5: Solve for x
    x = 741,321/807
  6. Step 6: Final answer
    x = 918.61

Related Problems

Find third proportional to 403.50 and 430.50
Half scale
Find third proportional to 1,614 and 1,722
Double scale
Find third proportional to 809 and 863
Similar ratio
Find third proportional to 1,210.50 and 1,291.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.