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Finding the Fourth Proportional to 13,201.40, 19,812.90 and 12,769.40

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Solution

The fourth proportional to 13,201.40, 19,812.90 and 12,769.40 is: 19,164.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,201.40 : 19,812.90 = 12,769.40 : x
  2. Step 2: Convert to fraction form
    13,201.40/19,812.90 = 12,769.40/x
  3. Step 3: Cross multiply
    13,201.40x = 19,812.90 × 12,769.40
  4. Step 4: Simplify right side
    13,201.40x = 252,998,845.26
  5. Step 5: Solve for x
    x = 252,998,845.26/13,201.40
  6. Step 6: Final answer
    x = 19,164.55

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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.