Home / 434.99-599.90-287.78

Finding the Fourth Proportional to 434.99, 599.90 and 287.78

Calculator

Solution

The fourth proportional to 434.99, 599.90 and 287.78 is: 396.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    434.99 : 599.90 = 287.78 : x
  2. Step 2: Convert to fraction form
    434.99/599.90 = 287.78/x
  3. Step 3: Cross multiply
    434.99x = 599.90 × 287.78
  4. Step 4: Simplify right side
    434.99x = 172,634.78
  5. Step 5: Solve for x
    x = 172,634.78/434.99
  6. Step 6: Final answer
    x = 396.87

Related Problems

Find fourth proportional to 217.50, 299.95 and 143.89
Half scale
Find fourth proportional to 869.98, 1,199.79 and 575.55
Double scale
Find fourth proportional to 435.99, 601.27 and 288.78
Similar ratio
Find fourth proportional to 652.49, 899.84 and 431.66
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.