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Finding the Fourth Proportional to 12,939.21, 19,410.03 and 4,620.11

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Solution

The fourth proportional to 12,939.21, 19,410.03 and 4,620.11 is: 6,930.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,939.21 : 19,410.03 = 4,620.11 : x
  2. Step 2: Convert to fraction form
    12,939.21/19,410.03 = 4,620.11/x
  3. Step 3: Cross multiply
    12,939.21x = 19,410.03 × 4,620.11
  4. Step 4: Simplify right side
    12,939.21x = 89,676,376.65
  5. Step 5: Solve for x
    x = 89,676,376.65/12,939.21
  6. Step 6: Final answer
    x = 6,930.59

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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.