Home / 3,947-9,120

Finding the Third Proportional to 3,947 and 9,120

Calculator

Solution

The third proportional to 3,947 and 9,120 is: 21,072.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,947 : 9,120 = 9,120 : x
  2. Step 2: Convert to fraction form
    3,947/9,120 = 9,120/x
  3. Step 3: Cross multiply
    3,947x = 9,120 × 9,120
  4. Step 4: Simplify right side
    3,947x = 83,174,400
  5. Step 5: Solve for x
    x = 83,174,400/3,947
  6. Step 6: Final answer
    x = 21,072.81

Related Problems

Find third proportional to 1,973.50 and 4,560
Half scale
Find third proportional to 7,894 and 18,240
Double scale
Find third proportional to 3,949 and 9,125
Similar ratio
Find third proportional to 5,920.50 and 13,680
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.