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Finding the Fourth Proportional to 13,979.71, 20,963.08 and 5,212.27

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Solution

The fourth proportional to 13,979.71, 20,963.08 and 5,212.27 is: 7,815.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,979.71 : 20,963.08 = 5,212.27 : x
  2. Step 2: Convert to fraction form
    13,979.71/20,963.08 = 5,212.27/x
  3. Step 3: Cross multiply
    13,979.71x = 20,963.08 × 5,212.27
  4. Step 4: Simplify right side
    13,979.71x = 109,265,187.10
  5. Step 5: Solve for x
    x = 109,265,187.10/13,979.71
  6. Step 6: Final answer
    x = 7,815.99

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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.