Home / 20,115.20-27,759.28-11,163.29

Finding the Fourth Proportional to 20,115.20, 27,759.28 and 11,163.29

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Solution

The fourth proportional to 20,115.20, 27,759.28 and 11,163.29 is: 15,405.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,115.20 : 27,759.28 = 11,163.29 : x
  2. Step 2: Convert to fraction form
    20,115.20/27,759.28 = 11,163.29/x
  3. Step 3: Cross multiply
    20,115.20x = 27,759.28 × 11,163.29
  4. Step 4: Simplify right side
    20,115.20x = 309,884,830.60
  5. Step 5: Solve for x
    x = 309,884,830.60/20,115.20
  6. Step 6: Final answer
    x = 15,405.50

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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.