Home / 453.26-679.78-209.55

Finding the Fourth Proportional to 453.26, 679.78 and 209.55

Calculator

Solution

The fourth proportional to 453.26, 679.78 and 209.55 is: 314.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    453.26 : 679.78 = 209.55 : x
  2. Step 2: Convert to fraction form
    453.26/679.78 = 209.55/x
  3. Step 3: Cross multiply
    453.26x = 679.78 × 209.55
  4. Step 4: Simplify right side
    453.26x = 142,451.30
  5. Step 5: Solve for x
    x = 142,451.30/453.26
  6. Step 6: Final answer
    x = 314.28

Related Problems

Find fourth proportional to 226.63, 339.89 and 104.78
Half scale
Find fourth proportional to 906.53, 1,359.57 and 419.11
Double scale
Find fourth proportional to 454.26, 681.28 and 210.55
Similar ratio
Find fourth proportional to 679.89, 1,019.68 and 314.33
1.5x scale

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.