Home / 514.40-765.60-512.80

Finding the Fourth Proportional to 514.40, 765.60 and 512.80

Calculator

Solution

The fourth proportional to 514.40, 765.60 and 512.80 is: 763.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    514.40 : 765.60 = 512.80 : x
  2. Step 2: Convert to fraction form
    514.40/765.60 = 512.80/x
  3. Step 3: Cross multiply
    514.40x = 765.60 × 512.80
  4. Step 4: Simplify right side
    514.40x = 392,599.68
  5. Step 5: Solve for x
    x = 392,599.68/514.40
  6. Step 6: Final answer
    x = 763.22

Related Problems

Find fourth proportional to 257.20, 382.80 and 256.40
Half scale
Find fourth proportional to 1,028.80, 1,531.20 and 1,025.60
Double scale
Find fourth proportional to 515.40, 767.09 and 513.80
Similar ratio
Find fourth proportional to 771.60, 1,148.40 and 769.20
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.