Home / 12,840-19,928

Finding the Third Proportional to 12,840 and 19,928

Calculator

Solution

The third proportional to 12,840 and 19,928 is: 30,928.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,840 : 19,928 = 19,928 : x
  2. Step 2: Convert to fraction form
    12,840/19,928 = 19,928/x
  3. Step 3: Cross multiply
    12,840x = 19,928 × 19,928
  4. Step 4: Simplify right side
    12,840x = 397,125,184
  5. Step 5: Solve for x
    x = 397,125,184/12,840
  6. Step 6: Final answer
    x = 30,928.75

Related Problems

Find third proportional to 6,420 and 9,964
Half scale
Find third proportional to 25,680 and 39,856
Double scale
Find third proportional to 12,842 and 19,931
Similar ratio
Find third proportional to 19,260 and 29,892
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.