Home / 855-1,210.78

Finding the Third Proportional to 855 and 1,210.78

Calculator

Solution

The third proportional to 855 and 1,210.78 is: 1,714.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    855 : 1,210.78 = 1,210.78 : x
  2. Step 2: Convert to fraction form
    855/1,210.78 = 1,210.78/x
  3. Step 3: Cross multiply
    855x = 1,210.78 × 1,210.78
  4. Step 4: Simplify right side
    855x = 1,465,991.24
  5. Step 5: Solve for x
    x = 1,465,991.24/855
  6. Step 6: Final answer
    x = 1,714.61

Related Problems

Find third proportional to 427.50 and 605.39
Half scale
Find third proportional to 1,710 and 2,421.56
Double scale
Find third proportional to 857 and 1,214
Similar ratio
Find third proportional to 1,282.50 and 1,816.17
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.