Home / 878.68-1,212.59-485.70

Finding the Fourth Proportional to 878.68, 1,212.59 and 485.70

Calculator

Solution

The fourth proportional to 878.68, 1,212.59 and 485.70 is: 670.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.68 : 1,212.59 = 485.70 : x
  2. Step 2: Convert to fraction form
    878.68/1,212.59 = 485.70/x
  3. Step 3: Cross multiply
    878.68x = 1,212.59 × 485.70
  4. Step 4: Simplify right side
    878.68x = 588,954.96
  5. Step 5: Solve for x
    x = 588,954.96/878.68
  6. Step 6: Final answer
    x = 670.27

Related Problems

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.