Home / 290.08-400-207.20

Finding the Fourth Proportional to 290.08, 400 and 207.20

Calculator

Solution

The fourth proportional to 290.08, 400 and 207.20 is: 285.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.08 : 400 = 207.20 : x
  2. Step 2: Convert to fraction form
    290.08/400 = 207.20/x
  3. Step 3: Cross multiply
    290.08x = 400 × 207.20
  4. Step 4: Simplify right side
    290.08x = 82,880
  5. Step 5: Solve for x
    x = 82,880/290.08
  6. Step 6: Final answer
    x = 285.71

Related Problems

Find fourth proportional to 145.04, 200 and 103.60
Half scale
Find fourth proportional to 580.16, 800 and 414.40
Double scale
Find fourth proportional to 291.08, 401.38 and 208.20
Similar ratio
Find fourth proportional to 435.12, 600 and 310.80
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.