Home / 20,571.20-28,388.36-11,139.80

Finding the Fourth Proportional to 20,571.20, 28,388.36 and 11,139.80

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Solution

The fourth proportional to 20,571.20, 28,388.36 and 11,139.80 is: 15,372.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,571.20 : 28,388.36 = 11,139.80 : x
  2. Step 2: Convert to fraction form
    20,571.20/28,388.36 = 11,139.80/x
  3. Step 3: Cross multiply
    20,571.20x = 28,388.36 × 11,139.80
  4. Step 4: Simplify right side
    20,571.20x = 316,240,652.73
  5. Step 5: Solve for x
    x = 316,240,652.73/20,571.20
  6. Step 6: Final answer
    x = 15,372.98

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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.