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Finding the Fourth Proportional to 12,615, 18,905.40 and 4,819.56

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Solution

The fourth proportional to 12,615, 18,905.40 and 4,819.56 is: 7,222.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,615 : 18,905.40 = 4,819.56 : x
  2. Step 2: Convert to fraction form
    12,615/18,905.40 = 4,819.56/x
  3. Step 3: Cross multiply
    12,615x = 18,905.40 × 4,819.56
  4. Step 4: Simplify right side
    12,615x = 91,115,709.62
  5. Step 5: Solve for x
    x = 91,115,709.62/12,615
  6. Step 6: Final answer
    x = 7,222.81

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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.