Home / 39,655-54,723.90-21,991

Finding the Fourth Proportional to 39,655, 54,723.90 and 21,991

Calculator

Solution

The fourth proportional to 39,655, 54,723.90 and 21,991 is: 30,347.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,655 : 54,723.90 = 21,991 : x
  2. Step 2: Convert to fraction form
    39,655/54,723.90 = 21,991/x
  3. Step 3: Cross multiply
    39,655x = 54,723.90 × 21,991
  4. Step 4: Simplify right side
    39,655x = 1,203,433,284.90
  5. Step 5: Solve for x
    x = 1,203,433,284.90/39,655
  6. Step 6: Final answer
    x = 30,347.58

Related Problems

Find fourth proportional to 19,827.50, 27,361.95 and 10,995.50
Half scale
Find fourth proportional to 79,310, 109,447.80 and 43,982
Double scale
Find fourth proportional to 39,656, 54,725.28 and 21,992
Similar ratio
Find fourth proportional to 59,482.50, 82,085.85 and 32,986.50
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.