Home / 871-980

Finding the Third Proportional to 871 and 980

Calculator

Solution

The third proportional to 871 and 980 is: 1,102.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    871 : 980 = 980 : x
  2. Step 2: Convert to fraction form
    871/980 = 980/x
  3. Step 3: Cross multiply
    871x = 980 × 980
  4. Step 4: Simplify right side
    871x = 960,400
  5. Step 5: Solve for x
    x = 960,400/871
  6. Step 6: Final answer
    x = 1,102.64

Related Problems

Find third proportional to 435.50 and 490
Half scale
Find third proportional to 1,742 and 1,960
Double scale
Find third proportional to 873 and 982
Similar ratio
Find third proportional to 1,306.50 and 1,470
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.