Home / 268.80-402.54-138.57

Finding the Fourth Proportional to 268.80, 402.54 and 138.57

Calculator

Solution

The fourth proportional to 268.80, 402.54 and 138.57 is: 207.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.80 : 402.54 = 138.57 : x
  2. Step 2: Convert to fraction form
    268.80/402.54 = 138.57/x
  3. Step 3: Cross multiply
    268.80x = 402.54 × 138.57
  4. Step 4: Simplify right side
    268.80x = 55,779.97
  5. Step 5: Solve for x
    x = 55,779.97/268.80
  6. Step 6: Final answer
    x = 207.51

Related Problems

Find fourth proportional to 134.40, 201.27 and 69.29
Half scale
Find fourth proportional to 537.60, 805.08 and 277.14
Double scale
Find fourth proportional to 269.80, 404.04 and 139.57
Similar ratio
Find fourth proportional to 403.20, 603.81 and 207.86
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.