Home / 870-1,305-262

Finding the Fourth Proportional to 870, 1,305 and 262

Calculator

Solution

The fourth proportional to 870, 1,305 and 262 is: 393

Step by Step Solution

  1. Step 1: Write the proportion equation
    870 : 1,305 = 262 : x
  2. Step 2: Convert to fraction form
    870/1,305 = 262/x
  3. Step 3: Cross multiply
    870x = 1,305 × 262
  4. Step 4: Simplify right side
    870x = 341,910
  5. Step 5: Solve for x
    x = 341,910/870
  6. Step 6: Final answer
    x = 393

Related Problems

Find fourth proportional to 435, 652.50 and 131
Half scale
Find fourth proportional to 1,740, 2,610 and 524
Double scale
Find fourth proportional to 871, 1,306.50 and 263
Similar ratio
Find fourth proportional to 1,305, 1,957.50 and 393
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.