Home / 26,640-39,960-8,172

Finding the Fourth Proportional to 26,640, 39,960 and 8,172

Calculator

Solution

The fourth proportional to 26,640, 39,960 and 8,172 is: 12,258

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,640 : 39,960 = 8,172 : x
  2. Step 2: Convert to fraction form
    26,640/39,960 = 8,172/x
  3. Step 3: Cross multiply
    26,640x = 39,960 × 8,172
  4. Step 4: Simplify right side
    26,640x = 326,553,120
  5. Step 5: Solve for x
    x = 326,553,120/26,640
  6. Step 6: Final answer
    x = 12,258

Related Problems

Find fourth proportional to 13,320, 19,980 and 4,086
Half scale
Find fourth proportional to 53,280, 79,920 and 16,344
Double scale
Find fourth proportional to 26,641, 39,961.50 and 8,173
Similar ratio
Find fourth proportional to 39,960, 59,940 and 12,258
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.