Home / 7,281-10,921.50-1,809

Finding the Fourth Proportional to 7,281, 10,921.50 and 1,809

Calculator

Solution

The fourth proportional to 7,281, 10,921.50 and 1,809 is: 2,713.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,281 : 10,921.50 = 1,809 : x
  2. Step 2: Convert to fraction form
    7,281/10,921.50 = 1,809/x
  3. Step 3: Cross multiply
    7,281x = 10,921.50 × 1,809
  4. Step 4: Simplify right side
    7,281x = 19,756,993.50
  5. Step 5: Solve for x
    x = 19,756,993.50/7,281
  6. Step 6: Final answer
    x = 2,713.50

Related Problems

Find fourth proportional to 3,640.50, 5,460.75 and 904.50
Half scale
Find fourth proportional to 14,562, 21,843 and 3,618
Double scale
Find fourth proportional to 7,282, 10,923 and 1,810
Similar ratio
Find fourth proportional to 10,921.50, 16,382.25 and 2,713.50
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.