Home / 775.80-1,069.61-609.75

Finding the Fourth Proportional to 775.80, 1,069.61 and 609.75

Calculator

Solution

The fourth proportional to 775.80, 1,069.61 and 609.75 is: 840.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.80 : 1,069.61 = 609.75 : x
  2. Step 2: Convert to fraction form
    775.80/1,069.61 = 609.75/x
  3. Step 3: Cross multiply
    775.80x = 1,069.61 × 609.75
  4. Step 4: Simplify right side
    775.80x = 652,191.65
  5. Step 5: Solve for x
    x = 652,191.65/775.80
  6. Step 6: Final answer
    x = 840.67

Related Problems

Find fourth proportional to 387.90, 534.80 and 304.88
Half scale
Find fourth proportional to 1,551.60, 2,139.21 and 1,219.50
Double scale
Find fourth proportional to 776.80, 1,070.98 and 610.75
Similar ratio
Find fourth proportional to 1,163.70, 1,604.41 and 914.63
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.