Home / 13,789.28-20,683.68-3,928.64

Finding the Fourth Proportional to 13,789.28, 20,683.68 and 3,928.64

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Solution

The fourth proportional to 13,789.28, 20,683.68 and 3,928.64 is: 5,892.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,789.28 : 20,683.68 = 3,928.64 : x
  2. Step 2: Convert to fraction form
    13,789.28/20,683.68 = 3,928.64/x
  3. Step 3: Cross multiply
    13,789.28x = 20,683.68 × 3,928.64
  4. Step 4: Simplify right side
    13,789.28x = 81,258,732.60
  5. Step 5: Solve for x
    x = 81,258,732.60/13,789.28
  6. Step 6: Final answer
    x = 5,892.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.