Home / 20,820-31,440

Finding the Third Proportional to 20,820 and 31,440

Calculator

Solution

The third proportional to 20,820 and 31,440 is: 47,477.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820 : 31,440 = 31,440 : x
  2. Step 2: Convert to fraction form
    20,820/31,440 = 31,440/x
  3. Step 3: Cross multiply
    20,820x = 31,440 × 31,440
  4. Step 4: Simplify right side
    20,820x = 988,473,600
  5. Step 5: Solve for x
    x = 988,473,600/20,820
  6. Step 6: Final answer
    x = 47,477.12

Related Problems

Find third proportional to 10,410 and 15,720
Half scale
Find third proportional to 41,640 and 62,880
Double scale
Find third proportional to 20,822 and 31,443
Similar ratio
Find third proportional to 31,230 and 47,160
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.