Home / 985.20-1,381.20-985.20

Finding the Fourth Proportional to 985.20, 1,381.20 and 985.20

Calculator

Solution

The fourth proportional to 985.20, 1,381.20 and 985.20 is: 1,381.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.20 : 1,381.20 = 985.20 : x
  2. Step 2: Convert to fraction form
    985.20/1,381.20 = 985.20/x
  3. Step 3: Cross multiply
    985.20x = 1,381.20 × 985.20
  4. Step 4: Simplify right side
    985.20x = 1,360,758.24
  5. Step 5: Solve for x
    x = 1,360,758.24/985.20
  6. Step 6: Final answer
    x = 1,381.20

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.