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Finding the Fourth Proportional to 13,719.28, 20,578.86 and 4,485.28

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Solution

The fourth proportional to 13,719.28, 20,578.86 and 4,485.28 is: 6,727.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,719.28 : 20,578.86 = 4,485.28 : x
  2. Step 2: Convert to fraction form
    13,719.28/20,578.86 = 4,485.28/x
  3. Step 3: Cross multiply
    13,719.28x = 20,578.86 × 4,485.28
  4. Step 4: Simplify right side
    13,719.28x = 92,301,949.18
  5. Step 5: Solve for x
    x = 92,301,949.18/13,719.28
  6. Step 6: Final answer
    x = 6,727.90

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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.