Home / 858-1,221

Finding the Third Proportional to 858 and 1,221

Calculator

Solution

The third proportional to 858 and 1,221 is: 1,737.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    858 : 1,221 = 1,221 : x
  2. Step 2: Convert to fraction form
    858/1,221 = 1,221/x
  3. Step 3: Cross multiply
    858x = 1,221 × 1,221
  4. Step 4: Simplify right side
    858x = 1,490,841
  5. Step 5: Solve for x
    x = 1,490,841/858
  6. Step 6: Final answer
    x = 1,737.58

Related Problems

Find third proportional to 429 and 610.50
Half scale
Find third proportional to 1,716 and 2,442
Double scale
Find third proportional to 860 and 1,224
Similar ratio
Find third proportional to 1,287 and 1,831.50
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.