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Finding the Fourth Proportional to 13,939.50, 20,912.49 and 4,705.50

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Solution

The fourth proportional to 13,939.50, 20,912.49 and 4,705.50 is: 7,059.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,939.50 : 20,912.49 = 4,705.50 : x
  2. Step 2: Convert to fraction form
    13,939.50/20,912.49 = 4,705.50/x
  3. Step 3: Cross multiply
    13,939.50x = 20,912.49 × 4,705.50
  4. Step 4: Simplify right side
    13,939.50x = 98,403,721.70
  5. Step 5: Solve for x
    x = 98,403,721.70/13,939.50
  6. Step 6: Final answer
    x = 7,059.34

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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.