Home / 8,640-18,900

Finding the Third Proportional to 8,640 and 18,900

Calculator

Solution

The third proportional to 8,640 and 18,900 is: 41,343.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,640 : 18,900 = 18,900 : x
  2. Step 2: Convert to fraction form
    8,640/18,900 = 18,900/x
  3. Step 3: Cross multiply
    8,640x = 18,900 × 18,900
  4. Step 4: Simplify right side
    8,640x = 357,210,000
  5. Step 5: Solve for x
    x = 357,210,000/8,640
  6. Step 6: Final answer
    x = 41,343.75

Related Problems

Find third proportional to 4,320 and 9,450
Half scale
Find third proportional to 17,280 and 37,800
Double scale
Find third proportional to 8,642 and 18,904
Similar ratio
Find third proportional to 12,960 and 28,350
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.