Home / 570.40-855-281.80

Finding the Fourth Proportional to 570.40, 855 and 281.80

Calculator

Solution

The fourth proportional to 570.40, 855 and 281.80 is: 422.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.40 : 855 = 281.80 : x
  2. Step 2: Convert to fraction form
    570.40/855 = 281.80/x
  3. Step 3: Cross multiply
    570.40x = 855 × 281.80
  4. Step 4: Simplify right side
    570.40x = 240,939
  5. Step 5: Solve for x
    x = 240,939/570.40
  6. Step 6: Final answer
    x = 422.40

Related Problems

Find fourth proportional to 285.20, 427.50 and 140.90
Half scale
Find fourth proportional to 1,140.80, 1,710 and 563.60
Double scale
Find fourth proportional to 571.40, 856.50 and 282.80
Similar ratio
Find fourth proportional to 855.60, 1,282.50 and 422.70
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.