Home / 20.88-42.40

Finding the Third Proportional to 20.88 and 42.40

Calculator

Solution

The third proportional to 20.88 and 42.40 is: 86.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.88 : 42.40 = 42.40 : x
  2. Step 2: Convert to fraction form
    20.88/42.40 = 42.40/x
  3. Step 3: Cross multiply
    20.88x = 42.40 × 42.40
  4. Step 4: Simplify right side
    20.88x = 1,797.63
  5. Step 5: Solve for x
    x = 1,797.63/20.88
  6. Step 6: Final answer
    x = 86.08

Related Problems

Why These Related Problems?

These problems maintain the same ratio (2.03) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.