Home / 1,911-2,866.50-543

Finding the Fourth Proportional to 1,911, 2,866.50 and 543

Calculator

Solution

The fourth proportional to 1,911, 2,866.50 and 543 is: 814.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911 : 2,866.50 = 543 : x
  2. Step 2: Convert to fraction form
    1,911/2,866.50 = 543/x
  3. Step 3: Cross multiply
    1,911x = 2,866.50 × 543
  4. Step 4: Simplify right side
    1,911x = 1,556,509.50
  5. Step 5: Solve for x
    x = 1,556,509.50/1,911
  6. Step 6: Final answer
    x = 814.50

Related Problems

Find fourth proportional to 955.50, 1,433.25 and 271.50
Half scale
Find fourth proportional to 3,822, 5,733 and 1,086
Double scale
Find fourth proportional to 1,912, 2,868 and 544
Similar ratio
Find fourth proportional to 2,866.50, 4,299.75 and 814.50
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.