Home / 1,308.50-1,805.81-811.47

Finding the Fourth Proportional to 1,308.50, 1,805.81 and 811.47

Calculator

Solution

The fourth proportional to 1,308.50, 1,805.81 and 811.47 is: 1,119.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.50 : 1,805.81 = 811.47 : x
  2. Step 2: Convert to fraction form
    1,308.50/1,805.81 = 811.47/x
  3. Step 3: Cross multiply
    1,308.50x = 1,805.81 × 811.47
  4. Step 4: Simplify right side
    1,308.50x = 1,465,359.47
  5. Step 5: Solve for x
    x = 1,465,359.47/1,308.50
  6. Step 6: Final answer
    x = 1,119.88

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.