Home / 1,615-2,228.70-879

Finding the Fourth Proportional to 1,615, 2,228.70 and 879

Calculator

Solution

The fourth proportional to 1,615, 2,228.70 and 879 is: 1,213.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,615 : 2,228.70 = 879 : x
  2. Step 2: Convert to fraction form
    1,615/2,228.70 = 879/x
  3. Step 3: Cross multiply
    1,615x = 2,228.70 × 879
  4. Step 4: Simplify right side
    1,615x = 1,959,027.30
  5. Step 5: Solve for x
    x = 1,959,027.30/1,615
  6. Step 6: Final answer
    x = 1,213.02

Related Problems

Find fourth proportional to 807.50, 1,114.35 and 439.50
Half scale
Find fourth proportional to 3,230, 4,457.40 and 1,758
Double scale
Find fourth proportional to 1,616, 2,230.08 and 880
Similar ratio
Find fourth proportional to 2,422.50, 3,343.05 and 1,318.50
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.