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Finding the Fourth Proportional to 100,939.70, 151,431.69 and 29,856.78

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Solution

The fourth proportional to 100,939.70, 151,431.69 and 29,856.78 is: 44,791.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,939.70 : 151,431.69 = 29,856.78 : x
  2. Step 2: Convert to fraction form
    100,939.70/151,431.69 = 29,856.78/x
  3. Step 3: Cross multiply
    100,939.70x = 151,431.69 × 29,856.78
  4. Step 4: Simplify right side
    100,939.70x = 4,521,262,653.36
  5. Step 5: Solve for x
    x = 4,521,262,653.36/100,939.70
  6. Step 6: Final answer
    x = 44,791.72

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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.