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Finding the Fourth Proportional to 70,761.72, 106,126.60 and 20,845.20

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Solution

The fourth proportional to 70,761.72, 106,126.60 and 20,845.20 is: 31,263.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,761.72 : 106,126.60 = 20,845.20 : x
  2. Step 2: Convert to fraction form
    70,761.72/106,126.60 = 20,845.20/x
  3. Step 3: Cross multiply
    70,761.72x = 106,126.60 × 20,845.20
  4. Step 4: Simplify right side
    70,761.72x = 2,212,230,202.32
  5. Step 5: Solve for x
    x = 2,212,230,202.32/70,761.72
  6. Step 6: Final answer
    x = 31,263.09

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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.