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Finding the Fourth Proportional to 12,479, 18,718.50 and 3,245

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Solution

The fourth proportional to 12,479, 18,718.50 and 3,245 is: 4,867.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,479 : 18,718.50 = 3,245 : x
  2. Step 2: Convert to fraction form
    12,479/18,718.50 = 3,245/x
  3. Step 3: Cross multiply
    12,479x = 18,718.50 × 3,245
  4. Step 4: Simplify right side
    12,479x = 60,741,532.50
  5. Step 5: Solve for x
    x = 60,741,532.50/12,479
  6. Step 6: Final answer
    x = 4,867.50

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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.