Home / 1,608.78-2,220-900.54

Finding the Fourth Proportional to 1,608.78, 2,220 and 900.54

Calculator

Solution

The fourth proportional to 1,608.78, 2,220 and 900.54 is: 1,242.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,608.78 : 2,220 = 900.54 : x
  2. Step 2: Convert to fraction form
    1,608.78/2,220 = 900.54/x
  3. Step 3: Cross multiply
    1,608.78x = 2,220 × 900.54
  4. Step 4: Simplify right side
    1,608.78x = 1,999,198.80
  5. Step 5: Solve for x
    x = 1,999,198.80/1,608.78
  6. Step 6: Final answer
    x = 1,242.68

Related Problems

Find fourth proportional to 804.39, 1,110 and 450.27
Half scale
Find fourth proportional to 3,217.56, 4,440 and 1,801.08
Double scale
Find fourth proportional to 1,609.78, 2,221.38 and 901.54
Similar ratio
Find fourth proportional to 2,413.17, 3,330 and 1,350.81
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.