Home / 834.36-1,251.78-257.28

Finding the Fourth Proportional to 834.36, 1,251.78 and 257.28

Calculator

Solution

The fourth proportional to 834.36, 1,251.78 and 257.28 is: 385.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    834.36 : 1,251.78 = 257.28 : x
  2. Step 2: Convert to fraction form
    834.36/1,251.78 = 257.28/x
  3. Step 3: Cross multiply
    834.36x = 1,251.78 × 257.28
  4. Step 4: Simplify right side
    834.36x = 322,057.96
  5. Step 5: Solve for x
    x = 322,057.96/834.36
  6. Step 6: Final answer
    x = 385.99

Related Problems

Find fourth proportional to 417.18, 625.89 and 128.64
Half scale
Find fourth proportional to 1,668.72, 2,503.56 and 514.56
Double scale
Find fourth proportional to 835.36, 1,253.28 and 258.28
Similar ratio
Find fourth proportional to 1,251.54, 1,877.67 and 385.92
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.