Home / 2,780-4,170-832.16

Finding the Fourth Proportional to 2,780, 4,170 and 832.16

Calculator

Solution

The fourth proportional to 2,780, 4,170 and 832.16 is: 1,248.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,780 : 4,170 = 832.16 : x
  2. Step 2: Convert to fraction form
    2,780/4,170 = 832.16/x
  3. Step 3: Cross multiply
    2,780x = 4,170 × 832.16
  4. Step 4: Simplify right side
    2,780x = 3,470,107.20
  5. Step 5: Solve for x
    x = 3,470,107.20/2,780
  6. Step 6: Final answer
    x = 1,248.24

Related Problems

Find fourth proportional to 1,390, 2,085 and 416.08
Half scale
Find fourth proportional to 5,560, 8,340 and 1,664.32
Double scale
Find fourth proportional to 2,781, 4,171.50 and 833.16
Similar ratio
Find fourth proportional to 4,170, 6,255 and 1,248.24
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.