Home / 421,707-918,288

Finding the Third Proportional to 421,707 and 918,288

Calculator

Solution

The third proportional to 421,707 and 918,288 is: 1,999,617.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,707 : 918,288 = 918,288 : x
  2. Step 2: Convert to fraction form
    421,707/918,288 = 918,288/x
  3. Step 3: Cross multiply
    421,707x = 918,288 × 918,288
  4. Step 4: Simplify right side
    421,707x = 843,252,850,944
  5. Step 5: Solve for x
    x = 843,252,850,944/421,707
  6. Step 6: Final answer
    x = 1,999,617.86

Related Problems

Find third proportional to 210,853.50 and 459,144
Half scale
Find third proportional to 843,414 and 1,836,576
Double scale
Find third proportional to 421,709 and 918,292
Similar ratio
Find third proportional to 632,560.50 and 1,377,432
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.