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Finding the Fourth Proportional to 79,640.72, 119,679.90 and 74,439.44

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Solution

The fourth proportional to 79,640.72, 119,679.90 and 74,439.44 is: 111,863.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,640.72 : 119,679.90 = 74,439.44 : x
  2. Step 2: Convert to fraction form
    79,640.72/119,679.90 = 74,439.44/x
  3. Step 3: Cross multiply
    79,640.72x = 119,679.90 × 74,439.44
  4. Step 4: Simplify right side
    79,640.72x = 8,908,904,735.26
  5. Step 5: Solve for x
    x = 8,908,904,735.26/79,640.72
  6. Step 6: Final answer
    x = 111,863.69

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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.