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Finding the Fourth Proportional to 139,242.78, 192,149.88 and 75,579.21

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Solution

The fourth proportional to 139,242.78, 192,149.88 and 75,579.21 is: 104,296.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,242.78 : 192,149.88 = 75,579.21 : x
  2. Step 2: Convert to fraction form
    139,242.78/192,149.88 = 75,579.21/x
  3. Step 3: Cross multiply
    139,242.78x = 192,149.88 × 75,579.21
  4. Step 4: Simplify right side
    139,242.78x = 14,522,536,131.99
  5. Step 5: Solve for x
    x = 14,522,536,131.99/139,242.78
  6. Step 6: Final answer
    x = 104,296.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.