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Finding the Fourth Proportional to 18,480.85, 27,721.28 and 5,153.30

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Solution

The fourth proportional to 18,480.85, 27,721.28 and 5,153.30 is: 7,729.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,480.85 : 27,721.28 = 5,153.30 : x
  2. Step 2: Convert to fraction form
    18,480.85/27,721.28 = 5,153.30/x
  3. Step 3: Cross multiply
    18,480.85x = 27,721.28 × 5,153.30
  4. Step 4: Simplify right side
    18,480.85x = 142,856,171.84
  5. Step 5: Solve for x
    x = 142,856,171.84/18,480.85
  6. Step 6: Final answer
    x = 7,729.96

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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.