Home / 20,815.52-28,725.64-11,383.88

Finding the Fourth Proportional to 20,815.52, 28,725.64 and 11,383.88

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Solution

The fourth proportional to 20,815.52, 28,725.64 and 11,383.88 is: 15,709.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,815.52 : 28,725.64 = 11,383.88 : x
  2. Step 2: Convert to fraction form
    20,815.52/28,725.64 = 11,383.88/x
  3. Step 3: Cross multiply
    20,815.52x = 28,725.64 × 11,383.88
  4. Step 4: Simplify right side
    20,815.52x = 327,009,066.60
  5. Step 5: Solve for x
    x = 327,009,066.60/20,815.52
  6. Step 6: Final answer
    x = 15,709.87

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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.