Home / 20,905.92-28,850.76-11,475.09

Finding the Fourth Proportional to 20,905.92, 28,850.76 and 11,475.09

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Solution

The fourth proportional to 20,905.92, 28,850.76 and 11,475.09 is: 15,835.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,905.92 : 28,850.76 = 11,475.09 : x
  2. Step 2: Convert to fraction form
    20,905.92/28,850.76 = 11,475.09/x
  3. Step 3: Cross multiply
    20,905.92x = 28,850.76 × 11,475.09
  4. Step 4: Simplify right side
    20,905.92x = 331,065,067.57
  5. Step 5: Solve for x
    x = 331,065,067.57/20,905.92
  6. Step 6: Final answer
    x = 15,835.95

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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.