Home / 561.85-842.78-511.45

Finding the Fourth Proportional to 561.85, 842.78 and 511.45

Calculator

Solution

The fourth proportional to 561.85, 842.78 and 511.45 is: 767.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.85 : 842.78 = 511.45 : x
  2. Step 2: Convert to fraction form
    561.85/842.78 = 511.45/x
  3. Step 3: Cross multiply
    561.85x = 842.78 × 511.45
  4. Step 4: Simplify right side
    561.85x = 431,037.27
  5. Step 5: Solve for x
    x = 431,037.27/561.85
  6. Step 6: Final answer
    x = 767.18

Related Problems

Find fourth proportional to 280.93, 421.39 and 255.73
Half scale
Find fourth proportional to 1,123.70, 1,685.55 and 1,022.90
Double scale
Find fourth proportional to 562.85, 844.28 and 512.45
Similar ratio
Find fourth proportional to 842.78, 1,264.16 and 767.18
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.