Home / 13,905.87-20,845.85-5,138.43

Finding the Fourth Proportional to 13,905.87, 20,845.85 and 5,138.43

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Solution

The fourth proportional to 13,905.87, 20,845.85 and 5,138.43 is: 7,702.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,905.87 : 20,845.85 = 5,138.43 : x
  2. Step 2: Convert to fraction form
    13,905.87/20,845.85 = 5,138.43/x
  3. Step 3: Cross multiply
    13,905.87x = 20,845.85 × 5,138.43
  4. Step 4: Simplify right side
    13,905.87x = 107,114,915.32
  5. Step 5: Solve for x
    x = 107,114,915.32/13,905.87
  6. Step 6: Final answer
    x = 7,702.86

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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.