Home / 20,385.95-28,130.36-11,431.60

Finding the Fourth Proportional to 20,385.95, 28,130.36 and 11,431.60

Calculator

Solution

The fourth proportional to 20,385.95, 28,130.36 and 11,431.60 is: 15,774.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,385.95 : 28,130.36 = 11,431.60 : x
  2. Step 2: Convert to fraction form
    20,385.95/28,130.36 = 11,431.60/x
  3. Step 3: Cross multiply
    20,385.95x = 28,130.36 × 11,431.60
  4. Step 4: Simplify right side
    20,385.95x = 321,574,895.89
  5. Step 5: Solve for x
    x = 321,574,895.89/20,385.95
  6. Step 6: Final answer
    x = 15,774.34

Related Problems

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.