Home / 572.21-858.30-139.37

Finding the Fourth Proportional to 572.21, 858.30 and 139.37

Calculator

Solution

The fourth proportional to 572.21, 858.30 and 139.37 is: 209.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.21 : 858.30 = 139.37 : x
  2. Step 2: Convert to fraction form
    572.21/858.30 = 139.37/x
  3. Step 3: Cross multiply
    572.21x = 858.30 × 139.37
  4. Step 4: Simplify right side
    572.21x = 119,616.98
  5. Step 5: Solve for x
    x = 119,616.98/572.21
  6. Step 6: Final answer
    x = 209.05

Related Problems

Find fourth proportional to 286.10, 429.15 and 69.68
Half scale
Find fourth proportional to 1,144.41, 1,716.60 and 278.73
Double scale
Find fourth proportional to 573.21, 859.80 and 140.37
Similar ratio
Find fourth proportional to 858.31, 1,287.45 and 209.05
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.