Home / 455-991

Finding the Third Proportional to 455 and 991

Calculator

Solution

The third proportional to 455 and 991 is: 2,158.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    455 : 991 = 991 : x
  2. Step 2: Convert to fraction form
    455/991 = 991/x
  3. Step 3: Cross multiply
    455x = 991 × 991
  4. Step 4: Simplify right side
    455x = 982,081
  5. Step 5: Solve for x
    x = 982,081/455
  6. Step 6: Final answer
    x = 2,158.42

Related Problems

Find third proportional to 227.50 and 495.50
Half scale
Find third proportional to 910 and 1,982
Double scale
Find third proportional to 457 and 995
Similar ratio
Find third proportional to 682.50 and 1,486.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.