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Finding the Fourth Proportional to 12,661.88, 18,979.85 and 5,270.63

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Solution

The fourth proportional to 12,661.88, 18,979.85 and 5,270.63 is: 7,900.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,661.88 : 18,979.85 = 5,270.63 : x
  2. Step 2: Convert to fraction form
    12,661.88/18,979.85 = 5,270.63/x
  3. Step 3: Cross multiply
    12,661.88x = 18,979.85 × 5,270.63
  4. Step 4: Simplify right side
    12,661.88x = 100,035,685.08
  5. Step 5: Solve for x
    x = 100,035,685.08/12,661.88
  6. Step 6: Final answer
    x = 7,900.54

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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.