Home / 269.90-404.71-139.70

Finding the Fourth Proportional to 269.90, 404.71 and 139.70

Calculator

Solution

The fourth proportional to 269.90, 404.71 and 139.70 is: 209.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.90 : 404.71 = 139.70 : x
  2. Step 2: Convert to fraction form
    269.90/404.71 = 139.70/x
  3. Step 3: Cross multiply
    269.90x = 404.71 × 139.70
  4. Step 4: Simplify right side
    269.90x = 56,539.35
  5. Step 5: Solve for x
    x = 56,539.35/269.90
  6. Step 6: Final answer
    x = 209.48

Related Problems

Find fourth proportional to 134.95, 202.36 and 69.85
Half scale
Find fourth proportional to 539.80, 809.43 and 279.41
Double scale
Find fourth proportional to 270.90, 406.21 and 140.70
Similar ratio
Find fourth proportional to 404.85, 607.07 and 209.55
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.