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Finding the Fourth Proportional to 20,935.64, 28,891.20 and 11,375.60

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Solution

The fourth proportional to 20,935.64, 28,891.20 and 11,375.60 is: 15,698.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,935.64 : 28,891.20 = 11,375.60 : x
  2. Step 2: Convert to fraction form
    20,935.64/28,891.20 = 11,375.60/x
  3. Step 3: Cross multiply
    20,935.64x = 28,891.20 × 11,375.60
  4. Step 4: Simplify right side
    20,935.64x = 328,654,734.72
  5. Step 5: Solve for x
    x = 328,654,734.72/20,935.64
  6. Step 6: Final answer
    x = 15,698.34

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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.