Home / 20,871.85-28,803.26-11,311.75

Finding the Fourth Proportional to 20,871.85, 28,803.26 and 11,311.75

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Solution

The fourth proportional to 20,871.85, 28,803.26 and 11,311.75 is: 15,610.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.85 : 28,803.26 = 11,311.75 : x
  2. Step 2: Convert to fraction form
    20,871.85/28,803.26 = 11,311.75/x
  3. Step 3: Cross multiply
    20,871.85x = 28,803.26 × 11,311.75
  4. Step 4: Simplify right side
    20,871.85x = 325,815,292.87
  5. Step 5: Solve for x
    x = 325,815,292.87/20,871.85
  6. Step 6: Final answer
    x = 15,610.27

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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.