Home / 379-521.40-362.80

Finding the Fourth Proportional to 379, 521.40 and 362.80

Calculator

Solution

The fourth proportional to 379, 521.40 and 362.80 is: 499.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    379 : 521.40 = 362.80 : x
  2. Step 2: Convert to fraction form
    379/521.40 = 362.80/x
  3. Step 3: Cross multiply
    379x = 521.40 × 362.80
  4. Step 4: Simplify right side
    379x = 189,163.92
  5. Step 5: Solve for x
    x = 189,163.92/379
  6. Step 6: Final answer
    x = 499.11

Related Problems

Find fourth proportional to 189.50, 260.70 and 181.40
Half scale
Find fourth proportional to 758, 1,042.80 and 725.60
Double scale
Find fourth proportional to 380, 522.78 and 363.80
Similar ratio
Find fourth proportional to 568.50, 782.10 and 544.20
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.