Home / 569.12-854-280.80

Finding the Fourth Proportional to 569.12, 854 and 280.80

Calculator

Solution

The fourth proportional to 569.12, 854 and 280.80 is: 421.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    569.12 : 854 = 280.80 : x
  2. Step 2: Convert to fraction form
    569.12/854 = 280.80/x
  3. Step 3: Cross multiply
    569.12x = 854 × 280.80
  4. Step 4: Simplify right side
    569.12x = 239,803.20
  5. Step 5: Solve for x
    x = 239,803.20/569.12
  6. Step 6: Final answer
    x = 421.36

Related Problems

Find fourth proportional to 284.56, 427 and 140.40
Half scale
Find fourth proportional to 1,138.24, 1,708 and 561.60
Double scale
Find fourth proportional to 570.12, 855.50 and 281.80
Similar ratio
Find fourth proportional to 853.68, 1,281 and 421.20
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.