Home / 850.05-1,172.31-555

Finding the Fourth Proportional to 850.05, 1,172.31 and 555

Calculator

Solution

The fourth proportional to 850.05, 1,172.31 and 555 is: 765.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.05 : 1,172.31 = 555 : x
  2. Step 2: Convert to fraction form
    850.05/1,172.31 = 555/x
  3. Step 3: Cross multiply
    850.05x = 1,172.31 × 555
  4. Step 4: Simplify right side
    850.05x = 650,632.05
  5. Step 5: Solve for x
    x = 650,632.05/850.05
  6. Step 6: Final answer
    x = 765.40

Related Problems

Find fourth proportional to 425.03, 586.16 and 277.50
Half scale
Find fourth proportional to 1,700.10, 2,344.62 and 1,110
Double scale
Find fourth proportional to 851.05, 1,173.69 and 556
Similar ratio
Find fourth proportional to 1,275.08, 1,758.47 and 832.50
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.