Home / 894.78-1,339.20-780.66

Finding the Fourth Proportional to 894.78, 1,339.20 and 780.66

Calculator

Solution

The fourth proportional to 894.78, 1,339.20 and 780.66 is: 1,168.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    894.78 : 1,339.20 = 780.66 : x
  2. Step 2: Convert to fraction form
    894.78/1,339.20 = 780.66/x
  3. Step 3: Cross multiply
    894.78x = 1,339.20 × 780.66
  4. Step 4: Simplify right side
    894.78x = 1,045,459.87
  5. Step 5: Solve for x
    x = 1,045,459.87/894.78
  6. Step 6: Final answer
    x = 1,168.40

Related Problems

Find fourth proportional to 447.39, 669.60 and 390.33
Half scale
Find fourth proportional to 1,789.56, 2,678.40 and 1,561.32
Double scale
Find fourth proportional to 895.78, 1,340.70 and 781.66
Similar ratio
Find fourth proportional to 1,342.17, 2,008.80 and 1,170.99
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.