Home / 521.20-781.08-392.80

Finding the Fourth Proportional to 521.20, 781.08 and 392.80

Calculator

Solution

The fourth proportional to 521.20, 781.08 and 392.80 is: 588.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.20 : 781.08 = 392.80 : x
  2. Step 2: Convert to fraction form
    521.20/781.08 = 392.80/x
  3. Step 3: Cross multiply
    521.20x = 781.08 × 392.80
  4. Step 4: Simplify right side
    521.20x = 306,808.22
  5. Step 5: Solve for x
    x = 306,808.22/521.20
  6. Step 6: Final answer
    x = 588.66

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.