Home / 435-599.76-287.40

Finding the Fourth Proportional to 435, 599.76 and 287.40

Calculator

Solution

The fourth proportional to 435, 599.76 and 287.40 is: 396.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    435 : 599.76 = 287.40 : x
  2. Step 2: Convert to fraction form
    435/599.76 = 287.40/x
  3. Step 3: Cross multiply
    435x = 599.76 × 287.40
  4. Step 4: Simplify right side
    435x = 172,371.02
  5. Step 5: Solve for x
    x = 172,371.02/435
  6. Step 6: Final answer
    x = 396.26

Related Problems

Find fourth proportional to 217.50, 299.88 and 143.70
Half scale
Find fourth proportional to 870, 1,199.52 and 574.80
Double scale
Find fourth proportional to 436, 601.14 and 288.40
Similar ratio
Find fourth proportional to 652.50, 899.64 and 431.10
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.