Home / 681.72-940.68-485.28

Finding the Fourth Proportional to 681.72, 940.68 and 485.28

Calculator

Solution

The fourth proportional to 681.72, 940.68 and 485.28 is: 669.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.72 : 940.68 = 485.28 : x
  2. Step 2: Convert to fraction form
    681.72/940.68 = 485.28/x
  3. Step 3: Cross multiply
    681.72x = 940.68 × 485.28
  4. Step 4: Simplify right side
    681.72x = 456,493.19
  5. Step 5: Solve for x
    x = 456,493.19/681.72
  6. Step 6: Final answer
    x = 669.62

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.