Home / 569-853.38-280.40

Finding the Fourth Proportional to 569, 853.38 and 280.40

Calculator

Solution

The fourth proportional to 569, 853.38 and 280.40 is: 420.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    569 : 853.38 = 280.40 : x
  2. Step 2: Convert to fraction form
    569/853.38 = 280.40/x
  3. Step 3: Cross multiply
    569x = 853.38 × 280.40
  4. Step 4: Simplify right side
    569x = 239,287.75
  5. Step 5: Solve for x
    x = 239,287.75/569
  6. Step 6: Final answer
    x = 420.54

Related Problems

Find fourth proportional to 284.50, 426.69 and 140.20
Half scale
Find fourth proportional to 1,138, 1,706.76 and 560.80
Double scale
Find fourth proportional to 570, 854.88 and 281.40
Similar ratio
Find fourth proportional to 853.50, 1,280.07 and 420.60
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.