Home / 766.55-1,149.85-218.78

Finding the Fourth Proportional to 766.55, 1,149.85 and 218.78

Calculator

Solution

The fourth proportional to 766.55, 1,149.85 and 218.78 is: 328.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.55 : 1,149.85 = 218.78 : x
  2. Step 2: Convert to fraction form
    766.55/1,149.85 = 218.78/x
  3. Step 3: Cross multiply
    766.55x = 1,149.85 × 218.78
  4. Step 4: Simplify right side
    766.55x = 251,563.02
  5. Step 5: Solve for x
    x = 251,563.02/766.55
  6. Step 6: Final answer
    x = 328.17

Related Problems

Find fourth proportional to 383.28, 574.93 and 109.39
Half scale
Find fourth proportional to 1,533.11, 2,299.70 and 437.56
Double scale
Find fourth proportional to 767.55, 1,151.35 and 219.78
Similar ratio
Find fourth proportional to 1,149.83, 1,724.78 and 328.17
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.