Home / 772.20-1,158-278.46

Finding the Fourth Proportional to 772.20, 1,158 and 278.46

Calculator

Solution

The fourth proportional to 772.20, 1,158 and 278.46 is: 417.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.20 : 1,158 = 278.46 : x
  2. Step 2: Convert to fraction form
    772.20/1,158 = 278.46/x
  3. Step 3: Cross multiply
    772.20x = 1,158 × 278.46
  4. Step 4: Simplify right side
    772.20x = 322,456.68
  5. Step 5: Solve for x
    x = 322,456.68/772.20
  6. Step 6: Final answer
    x = 417.58

Related Problems

Find fourth proportional to 386.10, 579 and 139.23
Half scale
Find fourth proportional to 1,544.40, 2,316 and 556.92
Double scale
Find fourth proportional to 773.20, 1,159.50 and 279.46
Similar ratio
Find fourth proportional to 1,158.30, 1,737 and 417.69
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.