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Finding the Fourth Proportional to 79,287.85, 118,931.10 and 20,122.68

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Solution

The fourth proportional to 79,287.85, 118,931.10 and 20,122.68 is: 30,183.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,287.85 : 118,931.10 = 20,122.68 : x
  2. Step 2: Convert to fraction form
    79,287.85/118,931.10 = 20,122.68/x
  3. Step 3: Cross multiply
    79,287.85x = 118,931.10 × 20,122.68
  4. Step 4: Simplify right side
    79,287.85x = 2,393,212,467.35
  5. Step 5: Solve for x
    x = 2,393,212,467.35/79,287.85
  6. Step 6: Final answer
    x = 30,183.85

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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.