Home / 687.36-1,031.20-200.40

Finding the Fourth Proportional to 687.36, 1,031.20 and 200.40

Calculator

Solution

The fourth proportional to 687.36, 1,031.20 and 200.40 is: 300.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.36 : 1,031.20 = 200.40 : x
  2. Step 2: Convert to fraction form
    687.36/1,031.20 = 200.40/x
  3. Step 3: Cross multiply
    687.36x = 1,031.20 × 200.40
  4. Step 4: Simplify right side
    687.36x = 206,652.48
  5. Step 5: Solve for x
    x = 206,652.48/687.36
  6. Step 6: Final answer
    x = 300.65

Related Problems

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.