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Finding the Fourth Proportional to 139,689.72, 192,771.81 and 76,027.97

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Solution

The fourth proportional to 139,689.72, 192,771.81 and 76,027.97 is: 104,918.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,689.72 : 192,771.81 = 76,027.97 : x
  2. Step 2: Convert to fraction form
    139,689.72/192,771.81 = 76,027.97/x
  3. Step 3: Cross multiply
    139,689.72x = 192,771.81 × 76,027.97
  4. Step 4: Simplify right side
    139,689.72x = 14,656,049,387.53
  5. Step 5: Solve for x
    x = 14,656,049,387.53/139,689.72
  6. Step 6: Final answer
    x = 104,918.60

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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.