Home / 849.40-1,273-328.90

Finding the Fourth Proportional to 849.40, 1,273 and 328.90

Calculator

Solution

The fourth proportional to 849.40, 1,273 and 328.90 is: 492.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.40 : 1,273 = 328.90 : x
  2. Step 2: Convert to fraction form
    849.40/1,273 = 328.90/x
  3. Step 3: Cross multiply
    849.40x = 1,273 × 328.90
  4. Step 4: Simplify right side
    849.40x = 418,689.70
  5. Step 5: Solve for x
    x = 418,689.70/849.40
  6. Step 6: Final answer
    x = 492.92

Related Problems

Find fourth proportional to 424.70, 636.50 and 164.45
Half scale
Find fourth proportional to 1,698.80, 2,546 and 657.80
Double scale
Find fourth proportional to 850.40, 1,274.50 and 329.90
Similar ratio
Find fourth proportional to 1,274.10, 1,909.50 and 493.35
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.