Home / 285-400

Finding the Third Proportional to 285 and 400

Calculator

Solution

The third proportional to 285 and 400 is: 561.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    285 : 400 = 400 : x
  2. Step 2: Convert to fraction form
    285/400 = 400/x
  3. Step 3: Cross multiply
    285x = 400 × 400
  4. Step 4: Simplify right side
    285x = 160,000
  5. Step 5: Solve for x
    x = 160,000/285
  6. Step 6: Final answer
    x = 561.40

Related Problems

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.