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Finding the Fourth Proportional to 67,279.44, 100,786.32 and 39,128.70

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Solution

The fourth proportional to 67,279.44, 100,786.32 and 39,128.70 is: 58,615.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,279.44 : 100,786.32 = 39,128.70 : x
  2. Step 2: Convert to fraction form
    67,279.44/100,786.32 = 39,128.70/x
  3. Step 3: Cross multiply
    67,279.44x = 100,786.32 × 39,128.70
  4. Step 4: Simplify right side
    67,279.44x = 3,943,637,679.38
  5. Step 5: Solve for x
    x = 3,943,637,679.38/67,279.44
  6. Step 6: Final answer
    x = 58,615.79

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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.