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Finding the Fourth Proportional to 13,212.75, 19,819.13 and 3,978.75

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Solution

The fourth proportional to 13,212.75, 19,819.13 and 3,978.75 is: 5,968.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,212.75 : 19,819.13 = 3,978.75 : x
  2. Step 2: Convert to fraction form
    13,212.75/19,819.13 = 3,978.75/x
  3. Step 3: Cross multiply
    13,212.75x = 19,819.13 × 3,978.75
  4. Step 4: Simplify right side
    13,212.75x = 78,855,343.59
  5. Step 5: Solve for x
    x = 78,855,343.59/13,212.75
  6. Step 6: Final answer
    x = 5,968.13

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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.