Home / 10,920-15,379

Finding the Third Proportional to 10,920 and 15,379

Calculator

Solution

The third proportional to 10,920 and 15,379 is: 21,658.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,920 : 15,379 = 15,379 : x
  2. Step 2: Convert to fraction form
    10,920/15,379 = 15,379/x
  3. Step 3: Cross multiply
    10,920x = 15,379 × 15,379
  4. Step 4: Simplify right side
    10,920x = 236,513,641
  5. Step 5: Solve for x
    x = 236,513,641/10,920
  6. Step 6: Final answer
    x = 21,658.76

Related Problems

Find third proportional to 5,460 and 7,689.50
Half scale
Find third proportional to 21,840 and 30,758
Double scale
Find third proportional to 10,922 and 15,382
Similar ratio
Find third proportional to 16,380 and 23,068.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.