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Finding the Fourth Proportional to 70,021.72, 104,974.26 and 25,640.20

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Solution

The fourth proportional to 70,021.72, 104,974.26 and 25,640.20 is: 38,438.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,021.72 : 104,974.26 = 25,640.20 : x
  2. Step 2: Convert to fraction form
    70,021.72/104,974.26 = 25,640.20/x
  3. Step 3: Cross multiply
    70,021.72x = 104,974.26 × 25,640.20
  4. Step 4: Simplify right side
    70,021.72x = 2,691,561,021.25
  5. Step 5: Solve for x
    x = 2,691,561,021.25/70,021.72
  6. Step 6: Final answer
    x = 38,438.94

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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.