Home / 3,840-4,240

Finding the Third Proportional to 3,840 and 4,240

Calculator

Solution

The third proportional to 3,840 and 4,240 is: 4,681.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,840 : 4,240 = 4,240 : x
  2. Step 2: Convert to fraction form
    3,840/4,240 = 4,240/x
  3. Step 3: Cross multiply
    3,840x = 4,240 × 4,240
  4. Step 4: Simplify right side
    3,840x = 17,977,600
  5. Step 5: Solve for x
    x = 17,977,600/3,840
  6. Step 6: Final answer
    x = 4,681.67

Related Problems

Find third proportional to 1,920 and 2,120
Half scale
Find third proportional to 7,680 and 8,480
Double scale
Find third proportional to 3,842 and 4,242
Similar ratio
Find third proportional to 5,760 and 6,360
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.