Home / 269.09-403.70-86.49

Finding the Fourth Proportional to 269.09, 403.70 and 86.49

Calculator

Solution

The fourth proportional to 269.09, 403.70 and 86.49 is: 129.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.09 : 403.70 = 86.49 : x
  2. Step 2: Convert to fraction form
    269.09/403.70 = 86.49/x
  3. Step 3: Cross multiply
    269.09x = 403.70 × 86.49
  4. Step 4: Simplify right side
    269.09x = 34,915.58
  5. Step 5: Solve for x
    x = 34,915.58/269.09
  6. Step 6: Final answer
    x = 129.76

Related Problems

Find fourth proportional to 134.54, 201.85 and 43.25
Half scale
Find fourth proportional to 538.17, 807.39 and 172.98
Double scale
Find fourth proportional to 270.09, 405.20 and 87.49
Similar ratio
Find fourth proportional to 403.63, 605.54 and 129.74
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.