Home / 900-1,350-379.91

Finding the Fourth Proportional to 900, 1,350 and 379.91

Calculator

Solution

The fourth proportional to 900, 1,350 and 379.91 is: 569.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    900 : 1,350 = 379.91 : x
  2. Step 2: Convert to fraction form
    900/1,350 = 379.91/x
  3. Step 3: Cross multiply
    900x = 1,350 × 379.91
  4. Step 4: Simplify right side
    900x = 512,881.88
  5. Step 5: Solve for x
    x = 512,881.88/900
  6. Step 6: Final answer
    x = 569.87

Related Problems

Find fourth proportional to 450, 675 and 189.96
Half scale
Find fourth proportional to 1,800, 2,700 and 759.83
Double scale
Find fourth proportional to 901, 1,351.50 and 380.91
Similar ratio
Find fourth proportional to 1,350, 2,025 and 569.87
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.