Home / 720.71-994.49-405.91

Finding the Fourth Proportional to 720.71, 994.49 and 405.91

Calculator

Solution

The fourth proportional to 720.71, 994.49 and 405.91 is: 560.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.71 : 994.49 = 405.91 : x
  2. Step 2: Convert to fraction form
    720.71/994.49 = 405.91/x
  3. Step 3: Cross multiply
    720.71x = 994.49 × 405.91
  4. Step 4: Simplify right side
    720.71x = 403,673.44
  5. Step 5: Solve for x
    x = 403,673.44/720.71
  6. Step 6: Final answer
    x = 560.11

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.